Need some help just changed my standard hawkeye wheels for 18" prodrive reps.. On the way home from the garage that put my tyres on and swapped the wheels over i put my foot down a bit and went to brake for a corner and the brake pedal was rock hard they were fine before i went to the garage but the garage has only swapped the wheels and not touched the brakes.. Any one have any ideas whats wrong? There fine braking at normal speed but if you brake from high revs theres nothing there