Brake problem. Felt a pop under feet when idling. didn't see anything under the hood or under the car. Drove home. Gradually lost brake pressure. Got half way home and had to pump brakes 3-4 times to stop w/o standing on the brakes. Brake light came on. Got home...had to stand on the brakes to stop. MC was crazy low. Filled it, drove around the block. Brakes still go to the floor. I can stop but have to start way in advance and stand on em. Got back home, MC still full. Engine off, firm brakes after 3-4 pumps. Start engine...straight to the floor. Bad MC or bad brake booster?