Basically i have this annoying little problem with my brakes & with slight over revving, ive pretty much learned to live with it now as its been happening for ages but would be nice to fix. Anyway sometimes when i press my brakes the pedal will drop and go hard (usually get a kind of feeling of compressed air under the pedal which i think is normal) but when that happens it also effects the revs (they stay high for a while before dropping) just wondering if this could be a leaking brake servo as I'm unsure how they work to be honest.. ive tried fiddling about with the vacuum pipe that goes to the servo which seems to make it slightly better for a bit but will go back to how it was when driving again. Cheers 