Yesterday my brakes just about stopped working! I only get very small amount of braking when my foot is planted on the floor, 4 days before I replaced the rear pads and bled the brakes thoroughly. Everything was working fine, I thought it may be air or something so I re bled them this afternoon. Still no change, on all brakes the fluid comes poring out when i pump the brakes, but pressure doesn't build up. Ask me whatever else you need to know, not exactly sure what you need to know. Friend mentioned something about the master cylinder?