'88 5KSQ (Type 44) Brake Problems

[Fred Munro]

The servo detects the application of the brake and feeds power (in the form
of high pressure fluid from the bomb) to assist in applying the master
cylinder. Low foot pressure = high effort at the master cylinder. With a
dead bomb or bad servo, low foot pressure = low effort at the master
cylinder = high foot pressure = panic = stained drivers seat.
The master cylinder is indeed a critical part. The warning lights are also
critical to the safe operation of the braking system. Why is your switch
disabled? It may be trying to tell you something.

HTH

Fred Munro
'94 S4  112k km

----- Original Message -----
From: "Christopher Ritchie" <critchie1 at hotmail.com>
To: <quattro at audifans.com>
Sent: Wednesday, September 27, 2000 9:12 PM
Subject: '88 5KSQ (Type 44) Brake Problems


> The brake pedal on my '88 5KSQ will slowly go to or near the floor if I
hold
> pressure on it.  The warning light switch on the servo for the Autocheck
> system is disabled.  The car has a new pump and pressure accumulator
> ("bomb").  In a normal car, I would suspect the master cylinder.  But what
> is the "brake servo"?  That is the thing between the pedal and the master
> cylinder.  What does it do?
>
> At about 120K miles, I am ready to replace the master cylinder.  No
rebuilds
> for this critical part.  Should I also replace the servo?
>
>
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