[s-cars] Brakes seize up when engine is warm

[Joshua Van Tol]

The conclusive way to diagnose this is to bring along a bucket of ice
water, and cool the MC with it while it's exhibiting the symptom and see if
it goes away. But it most certainly will.

On Fri, Apr 13, 2012 at 12:23 PM, Wylie Bean <theringmeister at triad.rr.com>wrote:

> Sounds like the master cylinder.  I've heard of this behaviour with a 200.
> Wylie Bean
> 90 cq
> 91 90q20v
> 92 UrS4
> 08 Q7
>
> -----Original Message-----
> From: Thomas Rodriguez <trodri69 at gmail.com>
> Sender: s-car-list-bounces at audifans.com
> Date: Fri, 13 Apr 2012 13:17:41
> To: s-car-list<s-car-list at audifans.com>
> Subject: [s-cars] Brakes seize up when engine is warm
>
> The brakes in my '95 S6 started malfunctioning yesterday and I need
> some advice on the potential cause.
>
> The brakes perform normally when the car is first driven from a cold
> start.  As the entine warms up the brake pedal engages earlier and
> earlier until finally there is no play left at all.  At this stage the
> brake pedal becomes very hard and grabby as though it's getting way
> too much boost. If I continue to drive I can feel the brakes engaging
> on their own with progressively more pressure the longer I drive.
> Eventually the braking pressure becomes so strong that the car cannot
> be driven without smoking the brakes.  If the car is allowed to sit
> for a while and cool down the brake function returns to normal.
>
> When this happened yesterday the brake system warning lights lit up on
> the dash board.  The owner's manual instructed me to check the level
> of the brake fluid and hydraulic fluid.  I did this and found the
> brake fluid level to be fine but the hydraulic fluid level was way
> below its "low" mark.  I topped up the hydraulic fluid which took care
> of the warning lights on the dash board but the brakes still seized up
> the next time the car was driven long enough to warm up.
>
> The car is currently parked until I figure this out.  I would
> appreciate advice from anyone who has dealt with this sort of thing.
>
> Thanks, Tom
> '95 S6
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