Need Help with Brake Problem

[LL - NY]

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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