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

[Larry]

I have a recollection of this occurring on Type 44 turbos on the main list. Could be worth a search on the Quattro list. Going purely on memory (worth what yer paying for it), it points to a failing brake MC, some lister did give a plausible explanation on how the engine compartment heat caused the problem.

My $0.02,

LL-NY

sent from my iPod


On Apr 13, 2012, at 1:17 PM, Thomas Rodriguez <trodri69 at gmail.com> wrote:

> 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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