4kq brake problem

[Michael Stricker <stricker@ll.mit.edu>]

Hi,

I finally replaced the leaking master cylinder on my 4kq.  Thanks to 
everyone who shared their experiences and opinions.  I used a turkey 
baster (big syringe) to remove all of the brake fluid that leaked into 
the brake vacuum servo.  I bled the car and the brakes worked 
great...until a couple of days ago.  I noticed that every once in a while 
the brake pedal is hard to depress and get little or no brake action.  If 
I keep my foot on the pedal, the brakes come back to life.  It reminds me 
of the feeling I got when the "bomb" goes bad.  Could it be that there is 
a leak in the brake servo or could it be bad?  

There are no hydraulic leaks but could the proportioning valve fail in 
such a way to cause this problem.

Once again, your help is appreciated.


Paul Waterloo, if you read this, I'm interested in your Q outing.

Mike Stricker
1990 Quattro Coupe
1984 4kq
         in
West Hartford, CT