Suspect the brake servo. This si one place you could have 'internal
bleeding', with no outward signs. You would have fluid leaking into the
vacuum chamber of the booster, if this were the case. The vanishing fluid
would then be sucked into the engine, via the vacuum pipe, and finally
blasted out into the atmosphere.
To test, remove the booster end of the pipe, and employ olfactory testing
device to detect unwanted fluid.
I've suffered just such a failure, which was quickly fixed with a booster
overhaul.
Most of all, don't use the car until fixed, as could prove embarrasing,
should the whole system fail. It will not get any better, without surgery.
Regards,
Julian - SIII
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