Need Help with Brake Problem

[b1biker at aol.com]

 Thanks to everyone for the advice. I had suspicions about the master cylinder but since it's a pricey unit I was looking for confirmation. Someone mentioned the accumulator as a possible cause; I failed to mention that I have replaced that as well.
Gary Meier


 


 

-----Original Message-----
From: LL - NY <larrycleung at gmail.com>
To: b1biker at aol.com <b1biker at aol.com>
Cc: quattro at audifans.com
Sent: Sat, 19 Apr 2008 11:20 am
Subject: Re: Need Help with Brake Problem









Sounds like the infamous brake Master Cylinder failure. I'll let others
chime in as to the reasons, but as the cylinder heats up, failing seals
allows the M/C to pressurize the brake system. As I recall, the quick
test of the failure would be to cool the M/C (a douse of cool water
would do) when the brakes seem to be dragging and see if they release.
If they do, it's time to replace the M/C.


On 4/19/08, b1biker at aol.com <b1biker at aol.com> wrote:

Fellow Listers --

I need advice/expertise in solving a problem with the brakes on my 88
5KSQ. Intermittently the brakes will fail to release after they have
been applied. This condition may last for?a few minutes or the car
might have to set for a day or two before they release. The problem
affects all four wheels but as of late it has been having a greater
impact on the drivers side front wheel than on the others. When I began
working on this issue I found problems with both rear calipers, they
were subsequently replaced. I?just replaced the rubber lines to all
four wheels, they were in bad shape; as I was checking to see if the
problem had been eliminated?I made 4 short trips of 5-10 miles each, in
town,?on my way home the brakes hung up again. I've yet to check to see
if they have freed up overnight. Any advice on where to look/what to
repair or replaced would be greatly appreciated.
 Gary Meier
 86 Quantum GL5, 88 5KSQ, 91 Passat
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