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Old January 14th, 2007, 16:35   #12
BugBoyOne
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Join Date: Jan 2002
Location: Alberta
TDI(s): 2002 Jetta
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A passing master cylinder piston seal would explain this behaviour but why doesn't it pass with the booster out of the equation (i.e. with the engine off)? If the master cylinder is iffy, it should be iffy with the engine off as well.

I can generate very high brake system pressures with just my foot (no vacuum booster). Does the booster just generate higher still pressures and make any piston seal passing more evident?? As mentioned also, why do many behave like this after some kind of brake service, even after master cylinder replacements?

I will poll a few other TDI owners to see how common this pedal behaviour is.
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