When the engine is off, the pedal feel is firm and not too hard and impossible to push all the way down. When the engine is running, I can push the pedal all the way down (with some resistance) making this zooming noise. Question: Is this possible with a leaking (rebuild) BMC? Thanks. Regards, Maurits 1986 GV (Swiss WR) 1985 CGT KV 1982 GL DD