[urq] Stopping Power: 100%- 50%- 10%- FOLLOW UP

Eric Renneisen racingiron at comcast.net
Mon Apr 18 18:59:30 EDT 2005

I don't think you've got any problem with the hydraulic assist stuff
(pump, bomb, servo, etc.).  That system's job is to make your pedal
effort easier, and it doesn't often fail by giving you *too much*

Have you checked all the brake lines to be sure you don't have a leak
anywhere?  Are any of the rubber lines swelling?  From your description
(and assuming no leaks), I'm betting on the master cylinder.  Find the
source of that wet fart noise!  Bleed the brakes well to make sure it's
not just a big air bubble somewhere.

Eric Renneisen
'94 S4
'86 urq
'85 urq
Chattanooga, TN

-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On
Behalf Of Maurits Jonkergouw
Sent: Monday, April 18, 2005 6:36 PM
To: Audifans
Subject: [urq] Stopping Power: 100%- 50%- 10%- FOLLOW UP

Hey guys, remember my brake problem last week? Well, I changed the bomb
and filled the PS reservoir with new ATF Dexron II. Ran engine a few
minutes and bled the system (by locking the wheels from left to right 5
times -wheels off ground- and topped it off to maximum). Ran engine for
5 minutes again but the pedal is still soft. As a matter of fact it's
feels exactly the same like before (no brake feel). 

When I turn off the engine and push it 8-10 times, it gets harder but
never really hard, like a faulty bomb, even after +25 times, at this
point the pedal feels quit normal, like it used to, only key difference
is the engine is now off. When I restart engine, the pedal becomes soft
and mushy again, just like before... :-(

When I quickly "slap" the pedal numerous times (while engine running)
without pushing it all the way to the floor, I feel counter pressure
does come back, if I then push harder, I'll step right thru it, straight
to the bottom again, making this prrrrrtwhooooosch sound, like the sound
of a wet fart or baby shitting his/her diper.

I'm no expert on brakes and hydraulics, but something tells me is
seriously wrong. All I do know there are several possibilties left:

Hydraulic pump (but sounds good to me);
Master Cylinder (already bought rebuild kit);
Proportional valve;
Servo leakdown (saw no red puddles yet);
Pressure regulator (sweating at lower warning switch);
Pressure acumulator aka the bomb (fixed that).

Brake bleeding will be the next step, but perhaps it's already obvious
what's wrong?

Thanks again and again and again. Getting little anxious what might to


1986 GV (Swiss WR)
1985 CGT KV
1982 GL DD

Audifans urq mailing list
Send posts to: mailto:urq at audifans.com
Manage your list connection:
Have an urq question?  Check the Audifans Knowledgebase!
Have an urq answer? ... Please help others by adding to the KB ... all
contributions welcome!

More information about the urq mailing list