Clutch pedal gets sucked to floor on 85 4000s Quattro.

[Denis]

Mmmmm a new clutch.

Well most people put new disk and resurface the flywheel. It cost $$$$ for
what ? i dont know why.
I never do that unless the flywheel is really bad or the disk is over.

If the flywheel surface is good( lets check by good mechanic) and u did wait
until the rivets goes rub the flywheel, usually its fine.

If the diskl is fine and only need new pad go for itt.

I did that on my Audi and never got problems.

Denis


----- Original Message ----- 
From: "Liotta" <rliotta at alaska.net>
To: <quattro at audifans.com>
Cc: "Rick (at work) Liotta" <R.Liotta at conocophillips.com>; "Rick Liotta"
<rliotta at alaska.net>
Sent: Tuesday, February 08, 2005 3:54 AM
Subject: Clutch pedal gets sucked to floor on 85 4000s Quattro.


> Hi again--- I posted this back in November---
>
>
>           I own an 85 4000 Quattro--  about 130K miles.
>
>           Recently--  the clutch pedal does not come back to
>           the up position--
>           SOMETIMES!
>           The clutch is fine for about 20 miles-- then it just
>           lays 1/2 way
>           down--- and I have to use my toe to pick it back
>           up--  not a real big
>           deal-- except in 1st or reverse---  when things are
>           close to you!  It
>           acts this way for about 10 miles-- then it is fine
>           again.
>
>           Then this cycle repeats-- been going on for months
>           and months.
>
>           Can any one help??
>
>           Thanks very much-- Rick.
>
> And---- received these kind replies----
> 1---  From Dave----Replace your clutch master & slave cylinders. BTDT.
> Even if it appears that replacing the master fixes the problem...it
> won't hold long, do both...
>
> 2--- From Dave----Oh, BTDT is Been There, Done That. The parts are
> cheap, about $50 for the Master and $40 for the slave. Not sure about
> labor. Shouldn't be more than 3-4 hours.
>
> 3--from Denis----slave cyl on the tranny is going out .... i ll probably
> need to chage the
> master soon,,, the extra pressure from the new slave ll degrate the
> master
> if it got changed since long...
>
> The slave go bad very fast , dont wait. Look under the car if there is
> any
> brake oil leak between the tranny and the engine....
>
>
> 4---from Tom-- Not always the slave. Sometimes just the pressure hose to
> the slave from the
> master. Maybe you'll get lucky. Cheap fix.
>
> 5---This "extra pressure" argument is completely wacked. The reason they
>
> both go together is that they're about the same age, and tend to wear
> at the same rate. Also, the wear particles (rubber bits) from the
> failed component rarely get flushed properly and this contributes to
> the failure of the other component.
>
> The pressure in the hydraulic line is (almost) entirely related to the
> strength of the springs in the clutch. One slave or master vs another
> is not going to generate more or  less pressure.
> Josha
>
> 6---from William----Ask Mr. Jensen-the hose CAN rub against the drivers
> side inner CV.  His was cut due to an improper
> installation when he had clutch work done on the car a
> few years back.
>
> I was the lucky neighbor who took him back to the
> scene of the breakdown...and fortunately, the wrench
> who did the clutch job took care of the problem.
>
> Imagine the sigh of relief when it was noted that the
> problem was simply a hose.
>
> YMMV, there could be a pinhole leak or a crimped end
> giving way, etc.
>
>
> Now--  this happened this morning, when slipping the clutch and backing
> up into my workplace parking lot---
> The clutch pedal was sucked to the floor and the car took off--  I
> killed engine and stomped brakes.  The pedal was flush with the floor
> and would not stay up in "riding position" at all--  just gets sucked to
> the floor again when I pick it by getting under it with my foot.  There
> is no resistance to downward foot pressure at all-- it just gets
> 'sucked' down.
>
> >From what I can gather from your answers from 3 months back--  it
> sounds  like this is how the pedal operates:
> The "pedal return pressure" is due to internal clutch springs and this
> pressure is transferred via hydraulic fluid to the pedal.
>
> I figure I blew out lots (all?) of fluid this morning-- and the pedal is
> no longer being "pushed" by the fluid at all--  sound about right??
>
> Sounds like I tell Bruce (mechanic) that I probably need a new master
> and slave cylinder---- and to look for the leak?!--  Have I got this
> about right???
>
> And with any luck-- a new clutch (approx. $1200) will not be necessary!
>
> Thanks to you all!--- Rick
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