[Biturbos4] stoptech vibration

Quincy Chiang b5quattro at shaw.ca
Mon Sep 6 01:26:54 EDT 2004

I have this same issue on my stock brakes on my '90 CoupeQ, steering vibrates whenever I hit the brakes at over 50 kph.  It's been a few years now, replacing pads and discs only cure it for a few months, still haven't found the root cause.

On the S4 however, I've read on the AW forum that it's most likely uneven brake pad and pad desposit on the discs, as the discs themselves seldom warp.  I think a few folks managed to fix the problem by doing a proper bedding procedure, basically doing a bunch of 80-5 mph stops with minimal cooling in between.  Go to Stoptech's site for a full description of the procedure.

I'll try that on my coupe and see if it helps.

'01.5 S4
'90 CoupeQ

----- Original Message -----
From: Single Malt <s_malt at yahoo.com>
Date: Sunday, September 5, 2004 7:39 pm
Subject: RE: [Biturbos4]  stoptech vibration

> I am experiencing this symptom ... identically.  Oddly
> enough (sarcasm), it started right after using the
> brakes vigorously (~100mph down to ~30mph within 20
> yards or so) and repeatedly over a two day period.
> <grin>
> I'm thinking warped rotors (stock brakes/rotors), but
> close-up visual shows chunks of brake pad missing on
> all four pads on both sides.  The warp theory may
> still hold true as I suspect you can't really see the
> warp.
> Perhaps your vibration is warped rotors.
> --steve
> --- Bill Neilsen <wneils at hotmail.com> wrote:
> > 
> > 20k miles on the rotors and the whole front end
> > vibrates when I hit the 
> > brakes.  If I lightly push on them and bring the car
> > to a stop. t feels like 
> > they are grabbing and letting go in short bursts.
> > Any ideas?
> > 
> >         Bill
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