Brake pedal pulsation '88 5KCSQ Avant

[Paul Heneghan]

To: quattro at audifans.com
Date: Wed, 29 Aug 2001 09:30:59 -0400
Subject: Re: Brake pedal pulsation '88 5KCSQ Avant
From: Larry C Leung <l.leung at juno.com>

>Brake pedal pulses all of the time, even when the car is idling and
>stopped on the above, new to the owner (nice pearl REALLY clean, with
>Fuchs, kinda envious of the Fuchs! and the fact that it's an Avant). Bomb
>is dead, and didn't drive the car, but it really feels like the ABS is
>pulsing even when the car is perfectly stopped. Bad sensor cap or
>something?

A bad bomb will cause very noticeable pedal pulsation.  This is the effect
of the pump pumping discrete quantities of fluid 10s of times every second.
The bomb smooths out those pulsations.