Mastering the Brake Dance Troubleshooting a Sinking Brake Pedal

We have created this guide to show you why your brake pedal goes to the floor and what you can do to fix it. The pedal should not "go to the floor" at any time. There should come a point in the pedal travel where it no longer moves down. 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 ... Pedal going to the floor is a usual indication of leak or air in the system. But If you have a leaking brake booster, vacuum lines to it and if I am correct ... Is your brake pedal sinking all the way to the floor when you press it? Does it feel softer than normal, or spongy? The brake peddle is firm and at the top when the engine is off but sinks to the floor when you start the engine. Pedal going to floor typically sounds like a master cylinder problem. You can pump up the pedal and get a hard pedal. My braking pedal sometimes goes to floor during driving, mainly when I'm in a traffic jam and using the brakes actively. There was a previous thread that indicated the rubber brake lines are a probable source of weak brakes. ... https://www.amazon.com/dp/B0130X8XIE? 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 ...