Brakes Go To Floor When Car Is Running. If the pedal is soft the booster is working fine. The master brake cylinder is located behind the brake pedal on the other side of the engine bay’s firewall.
The only reason the pedal should go to the floor is if the brake fluid is gone or the master cylinder is not working. The brake pedal goes to the floor when the engine is running is quite a common phenomenon. Pedal going to the floor completely can only come due to air in the lines, or an internal (or external) leak.
While i was doing this i noticed the front right caliper was partially seized.
After bleeding the pedal seems hard until i start the car and then the pedal goes slowly to the floor. Check the brake fluid level. To start off with, check the brake lines and calipers. Brake goes to the floor before braking.
