Fwd: Brakes sticking, when hot

[Sandy Duffy <sandyduffy@home.com>]

>My brakes stick on, only when driving in stop and go type traffic, and
>or hot weather. Car is 86 5KTQ. just bled and replaced fluid. Seems to
>pass servo test per Benltey.Could it be the check valve on the bomb?
>Should I rebuild, replace the servo?
>Any btdt's?

Jeff:

Replace the master cylinder.  Had this happen on 2 (out of 3) Audis I've
owned.  Replacing MC ended problem.  BTW Bentlley says this part can not be
rebuilt.  I've bought rebuilts  from local parts store both times and both
times had no further problems.