Troubleshooting Brake Pedal to Floor The Mechanic's Bible

Pedal goes to the floor (or close to the floor) for only a few reasons. ... Or there is an external fluid leak. If the pdeal is not hard, there is ... Is your brake pedal sinking all the way to the floor when you press it? Does it feel softer than normal, or spongy? Most common causes are leaking brake line or brake cylinder. Have someone press the brakes while you look under the truck for leaks. No leaks? Reasons for a brake pedal going to the floor. 1. Leaks. You say you have none. 2. Bad master cylinder. You say you replaced it. 3. Bad brake booster. 4. Air in ... The pedal going down SOME when starting the engine with a power brake booster is normal, but the booster is making the air-in-the-system problem worse. If you are positive that there are no leaks (be sure to check all lines, wheel cylinders etc) then the most likely cause will be your master cylinder bypassing ... The brake peddle is firm and at the top when the engine is off but sinks to the floor when you start the engine. Causes and fixes when a brake pedal sinks suddenly all the way to the floor. Posible Causes Low on Brake Fluid Possible Brake Fluid Leak Air ... If your brake pedal goes to the floor you have a problem. If it were an older car I might suspect the brake master cylinder or even a leaking system. Misaligned brake shoes. If your car has rear drum brakes and the brake pedal goes to the floor, the rear brake shoes could be out of alignment.