[s-cars] argh...first the brake servo, now the rack...

[Douglas Fifield]

Peter,

I went through this last summer.  Fred Munro provided a test process
for the servo. You can find the thread by searching the archives for
"thrumming" in the subject line. I did a write-up on how to R&R the
servo.  Darrin said he would host it on S-cars.org and I can send you
a copy if it is not there.

Fred's test involved a short piece of metric brake line (bought an 8"
section at my local FLAPS along with a tube bending tool).  Bend it so
that you can attache it to the return line port on the servo (clamp
off the rubber return line hose before disconnecting the line).
Attach a piece of plastic tubing to the other end of your short brake
line. Run the free end of the tubing into a jar. Start the engine.
Keep your foot off the brake.  If you have hydraulic fluid running out
of the return port, through the tubing, into the jar, your servo is
toast.

D.

On 1/29/07, Ian Duff <iduff at comcast.net> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> Best of luck on the brakes stuff, no insight there.
>
> The steering on my S6 clunked a while back, it turned out one of the
> nuts mounting the rack was loose. PITA to diagnose, PITA to get to,
> but a very cheap fix. HTH.
>
> - -Ian.
>
> On  29 Jan 2007, at 9:22:02AM, Peter Schulz wrote:
>
> > Folks:
> >
> > need the list wisdom advice on three issues...
> >
> >     * Brake assist issue which I believe to be the brake servo...- I
> > replaced the bomb with a recharged unit and drained and replaced
> > most of
> > the fluid...After the R&R of the bomb, the brake light finally went
> > off
> > after a few minutes....but the hard brake pedal after startup did
> > not go
> > away, and soon the brake light was on again, constantly now.   I
> > checked
> > all the connections at the bomb ( line to brake servo, high pressure J
> > hose, return line to the hydraulic reservoir) and see no leakage.
> > At this
> > point, at idle, there is little brake assist, and if I rev the
> > engine for a
> > few minutes, I'll get more assist, but after three-5 hard pushes on
> > the
> > brake pedal, I get some feedback like pulsing, then eventually the
> > brake
> > pedal gets very hard to push....
> >     * I'm thinking servo, but how does one test the pump, and what
> > led the
> > servo to go bad AFTER I replaced the bomb? Did some crap get
> > dislodged?
> >     * Also observed that rack and servo return line to the pump
> > reservoir (
> > hard T shaped line) on the driver's side rail behind the ABS pump
> > looks
> > pretty rusty, will likely have to replace. any BTDTs?
> >     * Now for the fun part...steering rack clunks hard when turning -
> > observed the rack move 1/8 inch on the driver's side against the inner
> > fender well - the well looks intact, have to check the other side,
> > but it
> > at the very least needs some re enforcement...any BTDTs?
> >
> >
> > thanks..
> >
> > Happy monday....NOT
> >
> > -Peter
> >
> > (something to be said for a $500 90q20v as a backup car.......)
> >
> >
> >
> > -Peter Schulz
> > Chelmsford Ma, USA
> > http://www.naaclub.org/
> >
> > 1995.5 S6 Emerald/Ecru
> > 1991 200 20v Q Avant Titan Grey
> > 1991 200 20v Q Avant Indigo Mica (for Sale)
> > 1991 90 20v Q Red
> >
> > 1990 CQ silver
> > 1991 CQ silver  (eS2 recipient)
> > _______________________________________________
> > S-CAR-List mailing list
> > S-CAR-List at audifans.com
> > http://www.audifans.com/mailman/listinfo/s-car-list
> >
>
>
> -----BEGIN PGP SIGNATURE-----
> Version: PGP Desktop 9.5.3 (Build 5003)
> Charset: US-ASCII
>
> wsBVAwUBRb4HoAbfJQrv0DtCAQhkkAgAkJeRj2GM0bYT1R78Jg/XlaMF8UVC1Ao8
> 1YJEeBwAZjeciJDUWV5LoSw4blQWGxO1qVPy+bBN6bQXKKcr08wY6PJXgkRRW9DM
> mOlUInXyUlm+FySVW+qGRH6N+z/HCl1Ve4ZxaDl274XURZsiZidAlp+ymCZsfSXs
> 6q/h0nSriByT+CsRI2Sjdmm4Gem8AuCgQavXe8PMJuIFSD2FSzw4eGvpeowsta7v
> HGYrP8Ui0msg4aFoKx7ahfTWUL3o39lW8jEFuNFtNA/5cpCx0V54SGT5DOEyajd9
> ZvHV6QMQIHqKCkuXRiYB6bu4x1N8frkG4DSbuLxWHHTIKzB+HyUoTQ==
> =lrA8
> -----END PGP SIGNATURE-----
> _______________________________________________
> 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