[s-cars] Brake Light and Thrumming Pedal
brian hoeft
qweblog at gmail.com
Wed Jul 5 18:35:31 EDT 2006
hey, dude, i'll be home in an hour or so where i'll be able to
load/forward you some pics.
theres a rounded rectangular hole in the silver-metallic pedal bracket.
.. maybe you should back up, you might be looking past it.
its still not going to be easy. remember, attach as you go. fred's
cooler than me cause i never saw them, i only felt them. i even did
some of the searching with my eyes closed. .. i used 3/8 extentions,
fred used 1/4, whatever the case, if theyre through the bracket hole,
push until you hit firewall/servo then move cautiously till you feel
the nut,, pull back ever so slightly, then snatch it w/the socket.
..easier typed than done.
//brian
On 7/5/06, Douglas Fifield <douglas.fifield at gmail.com> wrote:
> OK, three nuts off, but I just can't see that fourth one and I can't
> figure how to snake the extensions up there. It looks completely
> blind and inaccessible. I know there is a way, but my spacial skills
> are hampered as I lay upside down under the dash. What a pain.
>
> Brian or Fred, you spoke of a "hole" in the pedal bracket that the
> extensions go through. I got the first three without using a "hole".
> Any clues out there?
>
> D.
>
> w sweat running into the ears
>
> On 7/5/06, Douglas Fifield <douglas.fifield at gmail.com> wrote:
> > Brian,
> >
> > The Bentley has the spec for the clevis. From memory, I think it is 230
> mm.
> >
> > D.
> >
> > On 7/5/06, brian hoeft <qweblog at gmail.com> wrote:
> > >
> > > alright doug, youre moving forward, good stuff.
> > >
> > > i kept the duct in place, but i did remove the strut brace and
> encountered
> > > no problems putting it back on, i also re-tightened after the first
> drive.
> > > as for that partition, i think there were 2 fasteners (bolts,or nuts, i
> > > forget) as well as being sort of clipped with ridges attaced to the
> > > fuse/relay area.. very fragile cardboard..
> > >
> > > keep in mind, i replaced my MC at the same time, so i had more room to
> get
> > > around the lines.. i think i just held them gently to the side during
> > > removal/replacement. i think the same should work for you,, if you have
> to
> > > touch them, so be it, just remember theyre not too tough.
> > >
> > >
> > > that pushrod is only a few (3?) inches into the MC, but once you have
> > > everything freed, it should be fine.
> > >
> > > also, keep in mind what fred pointed out earlier,, attach as you go.
> the
> > > extentions through the hole in the pedal bracket that is. you can hold
> > > them(extentions) on the other side near where the clutch pedal hinges as
> you
> > > go.
> > >
> > > also, that clevis pin.. i wont be able to get the specs to you for a
> few
> > > more hours, so hopefully someone else can chime in.. i think it was
> > > something like 205.5mm with only 1mm leeway. DONT quote me on that
> spec,
> > > but i remember a 6" dial caliper not being long enough. 12" is great...
> but
> > > even though mine was in spec, i had to open up my car again days later
> and
> > > re adjust because my brake lights came on with my car sitting in my
> > > driveway, if i thouched the car theyd go off/on so another 1/2 turn or
> so
> > > and perfecto..
> > >
> > > good luck for now, ill email those clevis pin details later if not done
> > > already..
> > >
> > >
> > > //brian
> > >
> > >
> > > On 7/5/06, Douglas Fifield <douglas.fifield at gmail.com> wrote:
> > > > All,
> > > >
> > > > Am underway on the project. Got airduct out of the way. Moved foam
> > > > aside. See three nuts but fourth is hidden. There is a fiberboard
> > > > sheild that may have to come out but I dont know on that yet.
> > > >
> > > > On the other side of the firewall, the two hard lines are disconnected
> > > > from the servo, capped and wrapped in plastic. The screws holding the
> > > > master cylinder and resevoir to the servo are out and I can wiggle the
> > > > MC a bit but not back it off the servo. I have released the clip on
> > > > the multi-line clamp holding the hard brake lines. This is one of two
> > > > such clamps and this is the one mounted on the wheel well. There is
> > > > another clip closer to the ABS unit.
> > > >
> > > > Do you recall if the lines need to be actually removed from the
> > > > restraint of the clips or just open the clip up? Second question -
> > > > does the cap on the resevoir need to come off to clear the strut
> > > > brace? Third - how far must the MC travel to clear the servo pushrod?
> > > >
> > > > All for now, write-up when done.
> > > >
> > > > D.
> > > >
> > > > On 7/4/06, Fred Munro <munrof at sympatico.ca> wrote:
> > > > > *Sigh* I knew I should have taken the time to take some photos and
> do a
> > > write-up on this. I think these cars are linked through the quantum
> field -
> > > when a component fails on one, others aren't far behind....At the time I
> > > just wanted to get the job done.
> > > > >
> > > > > Doug, I removed the knee bolster under the steering wheel and the
> > > drivers side footwell heating duct (the black plastic duct that runs
> across
> > > the drivers side footwell). There's an 8 mm bolt on the right side that
> > > secures it; it's just clipped on the left side. Once that is out of the
> way
> > > you can pull the sound deadening foam away from the right side of the
> pedal
> > > cluster and expose the servo nuts. You'll need a good light and go
> through a
> > > few contortions to see the top left nut. It's relatively easy to get
> off,
> > > but a little harder to get on.
> > > > >
> > > > > Fred
> > > > >
> > > > > -----Original Message-----
> > > > > From: Douglas Fifield [mailto:douglas.fifield at gmail.com]
> > > > > Sent: July 4, 2006 3:28 PM
> > > > > To: Fred Munro
> > > > > Cc: brian hoeft; s-car-list at audifans.com
> > > > > Subject: Re: [s-cars] Brake Light and Thrumming Pedal
> > > > >
> > > > >
> > > > > Happy Fourth everyone. I am spending mine laying on my back looking
> > > > > up under the dash and wondering how in the hell am I going to get at
> > > > > those 13 mm nuts.
> > > > >
> > > > > First, I can't see them. I see the servo push rod where it comes
> out
> > > > > and connects to the brake pedal, but there is some sounddeadning
> foam
> > > > > pasted up against the bulkhead hiding the nuts from view. I can't
> get
> > > > > a hand up there to try to move it.
> > > > >
> > > > > There are a couple of air ducts that go from side to side in the
> work
> > > > > area and it would be easier to access I think if the lower duct
> could
> > > > > come out. Brian, Fred, did you have to remove bits and pieces to
> get
> > > > > at the nuts? If so, do you remember what and how?
> > > > >
> > > > > Curious minds wish to know.
> > > > >
> > > > > D.
> > > > >
> > > > > On 7/3/06, Fred Munro < munrof at sympatico.ca> wrote:
> > > > > > Douglas;
> > > > > >
> > > > > > I've never had one apart, so I don't know what the failure mode
> is. It
> > > could be seals or wear on a seat. You'd want to be very confident in
> your
> > > ability to rebuild a servo given that these cars are totally impossible
> to
> > > stop without power assist. If your rebuild failed in use, well, it
> wouldn't
> > > be pretty.... I imagine the parts would be hard to acquire given they
> don't
> > > expect these to be rebuilt. They don't even want the old one back as a
> core.
> > > > > >
> > > > > > Fred
> > > > > >
> > > > > > -----Original Message-----
> > > > > > From: Douglas Fifield [mailto:douglas.fifield at gmail.com]
> > > > > > Sent: July 3, 2006 9:33 AM
> > > > > > To: Fred Munro
> > > > > > Cc: brian hoeft; s-car-list at audifans.com
> > > > > > Subject: Re: [s-cars] Brake Light and Thrumming Pedal
> > > > > >
> > > > > >
> > > > > > Fred,
> > > > > >
> > > > > > What is it that fails in the servo? Seals? Must be rebuildable,
> > > > > > wouldn't you think?
> > > > > >
> > > > > > D.
> > > > > >
> > > > > > On 7/3/06, Fred Munro < munrof at sympatico.ca> wrote:
> > > > > > > Douglas;
> > > > > > >
> > > > > > > You need one foam gasket between the firewall and the servo. The
> > > Bentley shows an o-ring between the servo and the master cylinder that
> > > doesn't show up on ETKA and wasn't on my OEM servo when I removed it -
> > > probably been superceded and not used. You will need 4 new locknuts for
> the
> > > servo studs. I reused the old pin clip but it doesn't hurt to replace
> it. As
> > > a matter of interest, the new servo I bought from the dealer was
> > > manufactured in 1992 and had an expiry date on the box of October 2006.
> > > > > > >
> > > > > > > Fred
> > > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: Douglas Fifield [mailto:douglas.fifield at gmail.com ]
> > > > > > > Sent: July 3, 2006 12:41 AM
> > > > > > > To: Fred Munro
> > > > > > > Cc: brian hoeft; s-car-list at audifans.com
> > > > > > > Subject: Re: [s-cars] Brake Light and Thrumming Pedal
> > > > > > >
> > > > > > >
> > > > > > > Bryan, Fred, All,
> > > > > > >
> > > > > > > Yes, it was the line on the very top of the servo that I
> > > disconnected
> > > > > > > and replaced with the 8" brake line. So it appears the servo is
> > > toast
> > > > > > > and needs replacement. Shit. Well, it is better to know what
> is
> > > bad
> > > > > > > and fix it than to not know at all. Will seek replacement
> tomorrow.
> > > > > > >
> > > > > > > Now, further questions - looking at the FA and the Bentley, it
> > > appears
> > > > > > > I need a replacement circlip for the pin, two gaskets (why 2),
> and 8
> > > > > > > lock nuts (why 8 and not 4). Is that the concensus?
> > > > > > >
> > > > > > > D.
> > > > > > >
> > > > > > > On 7/2/06, Fred Munro < munrof at sympatico.ca> wrote:
> > > > > > > > Douglas;
> > > > > > > >
> > > > > > > > If it's the return port you connected to (the one on top of
> the
> > > servo) your servo is toast. There should be no fluid coming out of this
> port
> > > unless the brake pedal is depressed.
> > > > > > > >
> > > > > > > > Fred
> > > > > > > >
> > > > > > > > -----Original Message-----
> > > > > > > > From: Douglas Fifield [mailto: douglas.fifield at gmail.com]
> > > > > > > > Sent: July 2, 2006 5:30 PM
> > > > > > > > To: brian hoeft
> > > > > > > > Cc: Fred Munro; s-car-list at audifans.com
> > > > > > > > Subject: Re: [s-cars] Brake Light and Thrumming Pedal
> > > > > > > >
> > > > > > > >
> > > > > > > > All - followup.
> > > > > > > >
> > > > > > > > Got the fitting loose. Got the bending tool - used it.
> Clamped
> > > return
> > > > > > > > line on servo and swapped it for the 8" brake line mit tube
> into
> > > > > > > > bottle. Started engine and watched a solid, pulsing flow of
> fluid
> > > > > > > > fill the tube and drain into the bottle.
> > > > > > > >
> > > > > > > > Please confirm that this means my servo is toast. If so, I
> will
> > > try
> > > > > > > > to source one tomorrow.
> > > > > > > >
> > > > > > > > D.
> > > > > > > >
> > > > > > > > On 7/2/06, brian hoeft <qweblog at gmail.com> wrote:
> > > > > > > > >
> > > > > > > > > i used a standard craftsman wrench..
> > > > > > > > >
> > > > > > > > > first make sure your turning it the proper way.. i know it
> > > sounds dumb but
> > > > > > > > > it isnt.
> > > > > > > > >
> > > > > > > > > you can typically feel when its gonna give and strip but its
> > > likely itll
> > > > > > > > > give and bust a knuckle just before that. i made sure my
> hand
> > > was clear of
> > > > > > > > > danger and went at it like i meant it. dont recall if i
> used
> > > PBblaster, but
> > > > > > > > > if youre worried you can wipe the excess before breaking it
> > > free..
> > > > > > > > >
> > > > > > > > > tis all for now, //brian
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > On 7/2/06, Douglas Fifield < douglas.fifield at gmail.com>
> wrote:
> > > > > > > > > > OK, I'll check. Here is my other question for the day.
> How
> > > in blazes
> > > > > > > > > > to you get the fitting on the return line off? I can't
> find
> > > clearance
> > > > > > > > > > for my 11 mm brake fitting wrench. I can get a cheap 11
> mm
> > > stubby on
> > > > > > > > > > there, but it didn't want to budge and I am afraid of
> using
> > > too much
> > > > > > > > > > force with that wrench and stripping the hex head on the
> > > fitting.
> > > > > > > > > >
> > > > > > > > > > I am leary of using penetrating oil in this application.
> > > > > > > > > >
> > > > > > > > > > Any suggestions?
> > > > > > > > > >
> > > > > > > > > > D.
> > > > > > > > > >
> > > > > > > > > > On 7/2/06, brian hoeft <qweblog at gmail.com> wrote:
> > > > > > > > > > >
> > > > > > > > > > > that same NAPA should sell a tube bender,the guys at the
> > > counter might
> > > > > > > > > know
> > > > > > > > > > > it better for bending brake lines.. looks kind of like a
> > > hockey stick
> > > > > > > > > w/a
> > > > > > > > > > > groove to hold the line in place.
> > > > > > > > > > >
> > > > > > > > > > > should be just a few bucks for the one you'll need.
> > > > > > > > > > >
> > > > > > > > > > > good luck, //brian
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > On 7/1/06, Douglas Fifield < douglas.fifield at gmail.com>
> > > wrote:
> > > > > > > > > > > > Fred,
> > > > > > > > > > > >
> > > > > > > > > > > > I just walked into the house from NAPA with an 8"
> section
> > > of metric
> > > > > > > > > > > > line. Sounds just like what you describe. Do you
> have
> > > advice on how
> > > > > > > > > > > > to bend it without kinking it?
> > > > > > > > > > > >
> > > > > > > > > > > > D.
> > > > > > > > > > > >
> > > > > > > > > > > > On 7/1/06, Fred Munro < munrof at sympatico.ca> wrote:
> > > > > > > > > > > > > Douglas;
> > > > > > > > > > > > >
> > > > > > > > > > > > > Ask for 3/16" European metric brake line. It will
> have
> > > the proper
> > > > > > > > > flare
> > > > > > > > > > > and nut.
> > > > > > > > > > > > >
> > > > > > > > > > > > > I've attached a photo of my test apparatus.
> > > > > > > > > > > > >
> > > > > > > > > > > > > Fred
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > -----Original Message-----
> > > > > > > > > > > > > From: Douglas Fifield [mailto:
> douglas.fifield at gmail.com
> > > ]
> > > > > > > > > > > > > Sent: July 1, 2006 12:16 PM
> > > > > > > > > > > > > To: Fred Munro
> > > > > > > > > > > > > Cc: s-car-list at audifans.com
> > > > > > > > > > > > > Subject: Re: [s-cars] Brake Light and Thrumming
> Pedal
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > All,
> > > > > > > > > > > > >
> > > > > > > > > > > > > So, if I want to test the servo as described and go
> to
> > > the FLAPS to
> > > > > > > > > > > > > get a piece of metric brake line, is there just one
> size
> > > of flanged
> > > > > > > > > > > > > fitting, or do I need to know the correct size? If
> the
> > > latter, can
> > > > > > > > > > > > > someone supply that info?
> > > > > > > > > > > > >
> > > > > > > > > > > > > Douglas
> > > > > > > > > > > > >
> > > > > > > > > > > > > On 6/30/06, Fred Munro < munrof at sympatico.ca> wrote:
> > > > > > > > > > > > > > Douglas;
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > If the level doesn't fall, the bomb is not being
> > > charged with
> > > > > > > > > fluid.
> > > > > > > > > > > This could be a really bad servo or a bad pump. At this
> > > point I'd do the
> > > > > > > > > > > servo test to rule that out. A totally dead bomb would
> also
> > > not draw
> > > > > > > > > fluid
> > > > > > > > > > > out of the reservoir, but it should allow the system to
> > > pressurize and
> > > > > > > > > the
> > > > > > > > > > > light would go out.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > I replaced the servo in a couple hours. You don't
> need
> > > to do a
> > > > > > > > > brake
> > > > > > > > > > > bleed - you remove the two bolts securing the master
> > > cylinder to the
> > > > > > > > > servo,
> > > > > > > > > > > release the brake lines to the MC from the multi-line
> clamp,
> > > and slide
> > > > > > > > > the
> > > > > > > > > > > MC off the servo without removing the brake lines. When
> the
> > > new servo is
> > > > > > > > > > > installed, you slide the MC back onto the servo and bolt
> it
> > > up. You
> > > > > > > > > don't
> > > > > > > > > > > have to open up the lines or bleed the brakes.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > As Brian mentioned, the servo is secured by four
> 13mm
> > > nuts that
> > > > > > > > > also
> > > > > > > > > > > secure the pedal cluster. The top left nut is a bit
> tricky
> > > as Brian
> > > > > > > > > points
> > > > > > > > > > > out, but I got it using 18" of 1/4" drive extensions and
> a
> > > flex end. You
> > > > > > > > > > > have to use 1/4" drive stuff or you can't see past the
> > > extensions to the
> > > > > > > > > > > nut. You have to use multiple extensions and assemble
> them
> > > as you insert
> > > > > > > > > > > them through the hole in the pedal cluster. Remember to
> get
> > > a new sponge
> > > > > > > > > > > gasket to seal the servo to the firewall. Unfortunately
> I
> > > didn't do a
> > > > > > > > > > > write-up on this.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Hopefully you don't need a servo, but the
> alternative
> > > is probably
> > > > > > > > > the
> > > > > > > > > > > pump. If the servo tests good, you'll have to make up a
> > > pressure testing
> > > > > > > > > rig
> > > > > > > > > > > or take the car to the dealer to test the pump output
> > > pressure.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > HTH
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Fred
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > -----Original Message-----
> > > > > > > > > > > > > > From: Douglas Fifield [mailto:
> > > douglas.fifield at gmail.com ]
> > > > > > > > > > > > > > Sent: June 30, 2006 11:07 AM
> > > > > > > > > > > > > > To: Fred Munro
> > > > > > > > > > > > > > Cc: s-car-list at audifans.com
> > > > > > > > > > > > > > Subject: Re: [s-cars] Brake Light and Thrumming
> Pedal
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Fred and Everyone Else,
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > Pushed the car out of the garage this morning,
> raised
> > > hood, had #1
> > > > > > > > > son
> > > > > > > > > > > > > > start engine while I watched G002000 level in
> > > resivoir. It was
> > > > > > > > > above
> > > > > > > > > > > > > > the full mark at about the seam level around the
> top
> > > of the tank.
> > > > > > > > > It
> > > > > > > > > > > > > > did not move discernably the whole time the engine
> was
> > > running.
> > > > > > > > > Brake
> > > > > > > > > > > > > > light was on and brake pedal thrumming. Turned
> engine
> > > off and
> > > > > > > > > brake
> > > > > > > > > > > > > > pedal was rock hard. Resivoir level never
> changed.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > What does this tell us? I will try to find the
> > > materials to do
> > > > > > > > > the
> > > > > > > > > > > > > > servo leak test, but I don't have those materials
> > > readily
> > > > > > > > > available.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > D.
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > On 6/29/06, Fred Munro < munrof at sympatico.ca>
> wrote:
> > > > > > > > > > > > > > > Douglas;
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Do the reservoir drawdown test I detailed in my
> > > earlier post. If
> > > > > > > > > the
> > > > > > > > > > > bomb is OK and the servo is leaking, the pump will
> partially
> > > charge the
> > > > > > > > > bomb
> > > > > > > > > > > and pull oil out of the reservoir with the engine
> running.
> > > Once you stop
> > > > > > > > > the
> > > > > > > > > > > engine, the oil will leak back out of the bomb through
> the
> > > servo and
> > > > > > > > > fill up
> > > > > > > > > > > the reservoir. If this happens, you'll have to test the
> > > servo to isolate
> > > > > > > > > it
> > > > > > > > > > > as the cause. This leak will be too large to do the
> Bentley
> > > servo test.
> > > > > > > > > You
> > > > > > > > > > > should use a test rig similar to what I described.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > If the bomb has failed, the pump will not put
> much
> > > oil into it
> > > > > > > > > and
> > > > > > > > > > > the level in the reservoir won't change much.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Fred
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > -----Original Message-----
> > > > > > > > > > > > > > > From: Douglas Fifield [mailto:
> > > douglas.fifield at gmail.com]
> > > > > > > > > > > > > > > Sent: June 29, 2006 4:24 PM
> > > > > > > > > > > > > > > To: Fred Munro
> > > > > > > > > > > > > > > Cc: s-car-list at audifans.com
> > > > > > > > > > > > > > > Subject: Re: [s-cars] Brake Light and Thrumming
> > > Pedal
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Fred et al,
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Things have progressed on the brake problem
> front.
> > > Now, as soon
> > > > > > > > > as
> > > > > > > > > > > I
> > > > > > > > > > > > > > > turn off the engine, the brake pedal goes rock
> hard.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > I am not sure if this means the bomb has failed,
> or
> > > if the servo
> > > > > > > > > is
> > > > > > > > > > > > > > > leaking so badly that the bomb cannot be
> > > pressurized.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > Any thoughts?
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > D.
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > On 6/28/06, Fred Munro < munrof at sympatico.ca>
> wrote:
> > > > > > > > > > > > > > > > Douglas;
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > The bomb has depressurized overnight. The
> brake
> > > light is on to
> > > > > > > > > > > warn of low
> > > > > > > > > > > > > > > > pressure in the brake boost system. The
> thrumming
> > > brake pedal
> > > > > > > > > is
> > > > > > > > > > > caused by
> > > > > > > > > > > > > > > > the pressure pulses from the positive
> displacement
> > > hydraulic
> > > > > > > > > pump.
> > > > > > > > > > > When you
> > > > > > > > > > > > > > > > apply the brakes with no stored pressure in
> the
> > > bomb, the
> > > > > > > > > boost
> > > > > > > > > > > pressure
> > > > > > > > > > > > > > > > comes from the pump and you feel the high and
> low
> > > pressure
> > > > > > > > > pulses
> > > > > > > > > > > as
> > > > > > > > > > > > > > > > vibration in the brake pedal.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > The bomb discharges due to a leaking check
> valve
> > > in the bomb
> > > > > > > > > or a
> > > > > > > > > > > leaking
> > > > > > > > > > > > > > > > brake servo. I used to believe the bomb check
> > > valve was the
> > > > > > > > > usual
> > > > > > > > > > > culprit,
> > > > > > > > > > > > > > > > but I now suspect the servo is usually at
> fault.
> > > The servo can
> > > > > > > > > > > leak by so
> > > > > > > > > > > > > > > > badly that the pump will never built up enough
> > > pressure to
> > > > > > > > > turn
> > > > > > > > > > > off the
> > > > > > > > > > > > > > > > warning light - I just had this problem in my
> '97
> > > S6. If your
> > > > > > > > > > > warning light
> > > > > > > > > > > > > > > > doesn't go off, this is most likely your
> problem.
> > > A bad bomb
> > > > > > > > > check
> > > > > > > > > > > valve
> > > > > > > > > > > > > > > > will not prevent the bomb from pressurizing to
> > > design
> > > > > > > > > pressure.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Flushing the central hydraulic fluid sometimes
> > > corrects the
> > > > > > > > > > > problem. Clean
> > > > > > > > > > > > > > > > the strainer in the reservoir when you flush
> the
> > > fluid.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > You can determine if you have a bad servo or
> check
> > > valve leak
> > > > > > > > > by
> > > > > > > > > > > running the
> > > > > > > > > > > > > > > > engine and noting the level in the reservoir.
> Shut
> > > off the
> > > > > > > > > engine
> > > > > > > > > > > and watch
> > > > > > > > > > > > > > > > the level. If you can see it visibly rising,
> > > either the servo
> > > > > > > > > is
> > > > > > > > > > > toast or
> > > > > > > > > > > > > > > > the bomb check valve is leaking badly. To test
> the
> > > servo, run
> > > > > > > > > the
> > > > > > > > > > > engine to
> > > > > > > > > > > > > > > > charge the bomb. Stop the engine. Remove the
> > > RETURN line on
> > > > > > > > > the
> > > > > > > > > > > servo (the
> > > > > > > > > > > > > > > > top connection). If more than a few drops of
> oil
> > > leaks out,
> > > > > > > > > the
> > > > > > > > > > > servo is
> > > > > > > > > > > > > > > > kaput. If you can see the fluid level rise in
> the
> > > reservoir,
> > > > > > > > > this
> > > > > > > > > > > test is
> > > > > > > > > > > > > > > > not a good one for two reasons:
> > > > > > > > > > > > > > > > 1. By the time you get the return line off,
> all
> > > the pressure
> > > > > > > > > has
> > > > > > > > > > > leaked out
> > > > > > > > > > > > > > > > and no oil will be released.
> > > > > > > > > > > > > > > > 2. If you do get the line off in time, so much
> oil
> > > will come
> > > > > > > > > out
> > > > > > > > > > > you'll have
> > > > > > > > > > > > > > > > it all over the rack and the driveway.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > I built a test rig to test my servo. I
> discharged
> > > the bomb
> > > > > > > > > > > completely by
> > > > > > > > > > > > > > > > pumping the brakes and removed the servo
> return
> > > line. I
> > > > > > > > > clamped
> > > > > > > > > > > off the
> > > > > > > > > > > > > > > > rubber section of the return line with a brake
> > > hose clamp. I
> > > > > > > > > bent
> > > > > > > > > > > a 8"
> > > > > > > > > > > > > > > > section of pre-made metric brake line at 90
> > > degrees and
> > > > > > > > > threaded
> > > > > > > > > > > one end
> > > > > > > > > > > > > > > > into the return line port. I attached a
> plastic
> > > hose on the
> > > > > > > > > other
> > > > > > > > > > > end and
> > > > > > > > > > > > > > > > ran the hose into a jar. Start the engine (do
> NOT
> > > apply the
> > > > > > > > > > > brakes!!!) and
> > > > > > > > > > > > > > > > watch the plastic line. A flow of oil
> indicates a
> > > leaking
> > > > > > > > > servo.
> > > > > > > > > > > On the '97
> > > > > > > > > > > > > > > > the oil flow was a steady stream - the servo
> was
> > > completely
> > > > > > > > > shot.
> > > > > > > > > > > Funny, the
> > > > > > > > > > > > > > > > car had just been certified too. That
> explained
> > > why the
> > > > > > > > > warning
> > > > > > > > > > > light was
> > > > > > > > > > > > > > > > disconnected......
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > HTH
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Fred Munro
> > > > > > > > > > > > > > > > '97 S6
> > > > > > > > > > > > > > > > '94 S4
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > -----Original Message-----
> > > > > > > > > > > > > > > > From: s-car-list-bounces at audifans.com
> > > > > > > > > > > > > > > > [mailto: s-car-list-bounces at audifans.com]On
> Behalf
> > > Of Douglas
> > > > > > > > > > > Fifield
> > > > > > > > > > > > > > > > Sent: June 28, 2006 9:27 PM
> > > > > > > > > > > > > > > > To: s-car-list at audifans.com
> > > > > > > > > > > > > > > > Subject: [s-cars] Brake Light and Thrumming
> Pedal
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Hedz,
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > We have been over this one before, but I keep
> > > hoping that
> > > > > > > > > someone
> > > > > > > > > > > will
> > > > > > > > > > > > > > > > have figured it out and give me a clue.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > On and off, my S6 has had periods where the
> brake
> > > light stays
> > > > > > > > > on
> > > > > > > > > > > > > > > > beyond the normal 20 or so seconds in the
> morning.
> > > These
> > > > > > > > > sessions
> > > > > > > > > > > > > > > > have been accompaning by a thrumming brake
> pedal
> > > and as long
> > > > > > > > > as
> > > > > > > > > > > that
> > > > > > > > > > > > > > > > continues, the brake light stays on. In the
> past,
> > > the
> > > > > > > > > thrumming
> > > > > > > > > > > would
> > > > > > > > > > > > > > > > eventually stop and a few seconds later, the
> light
> > > would go
> > > > > > > > > out.
> > > > > > > > > > > > > > > > Today, it stayed with me and now the car is in
> the
> > > garage.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > It seems to stop normally. Just had the
> brakes
> > > flushed last
> > > > > > > > > week
> > > > > > > > > > > and
> > > > > > > > > > > > > > > > the fluid levels are good.
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > Any ideas?
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > > --
> > > > > > > > > > > > > > > > Douglas in MN
> > > > > > > > > > > > > > > > 95.5 Audi S//6 Avant
> > > > > > > > > > > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > > > > > > > > > > >
> > > > > > > > > _______________________________________________
> > > > > > > > > > > > > > > > S-CAR-List mailing list
> > > > > > > > > > > > > > > > S-CAR-List at audifans.com
> > > > > > > > > > > > > > > >
> > > > > > > > > > >
> > > http://www.audifans.com/mailman/listinfo/s-car-list
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > > --
> > > > > > > > > > > > > > > Douglas in MN
> > > > > > > > > > > > > > > 95.5 Audi S//6 Avant
> > > > > > > > > > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > > > --
> > > > > > > > > > > > > > Douglas in MN
> > > > > > > > > > > > > > 95.5 Audi S//6 Avant
> > > > > > > > > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > > > > > > > > >
> > > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > --
> > > > > > > > > > > > > Douglas in MN
> > > > > > > > > > > > > 95.5 Audi S//6 Avant
> > > > > > > > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > Douglas in MN
> > > > > > > > > > > > 95.5 Audi S//6 Avant
> > > > > > > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > > > > > > >
> > > _______________________________________________
> > > > > > > > > > > > S-CAR-List mailing list
> > > > > > > > > > > > S-CAR-List at audifans.com
> > > > > > > > > > > >
> > > http://www.audifans.com/mailman/listinfo/s-car-list
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > Douglas in MN
> > > > > > > > > > 95.5 Audi S//6 Avant
> > > > > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > --
> > > > > > > > Douglas in MN
> > > > > > > > 95.5 Audi S//6 Avant
> > > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > --
> > > > > > > Douglas in MN
> > > > > > > 95.5 Audi S//6 Avant
> > > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Douglas in MN
> > > > > > 95.5 Audi S//6 Avant
> > > > > > 73 BMW R60/5 mit Toaster Tank
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Douglas in MN
> > > > > 95.5 Audi S//6 Avant
> > > > > 73 BMW R60/5 mit Toaster Tank
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Douglas in MN
> > > > 95.5 Audi S//6 Avant
> > > > 73 BMW R60/5 mit Toaster Tank
> > > >
> > >
> > >
> >
> >
> > --
> > Douglas in MN
> > 95.5 Audi S//6 Avant
> > 73 BMW R60/5 mit Toaster Tank
> >
>
>
> --
> Douglas in MN
> 95.5 Audi S//6 Avant
> 73 BMW R60/5 mit Toaster Tank
>
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