Disc front, drum rear. My brakes work fine. However they feel wierd sometimes. Here is what happens. First start up: brakes are fine, but a tad lower pedal than I like. About 60% down pedal. After about fifteen minutes of stop/start driving, the pedal begins to raise up some (about 5% down: just right to me). After further driving the pedal rises to 0% down (no slack whatsoever) until it is actually trying to stop the car as it drives. Wiered??? Any ideas?