Brake Pedal to the Floor Why It Happens and What to Do

The pedal suddenly started dropping to the floor, but only when running. I checked it and the brake booster was bad, so I replaced it. The issue being very concerning brake pedal behavior, where out of the blue after working perfectly normal, the brake pedal will seemingly disconnect itself. When the brake pedal goes to the floor, it could be due to a loss of hydraulic pressure in the brake system. This could be caused by a leak in ... Basically there's four things that can cause the brake pedal to go to the floor. 1. Air in the Brake Lines 2. Brake Fluid Leaking 3. Brake Booster Is Failing ... Some things I would check: 1. Is the fluid level dropping in the reservoir? Check for leaks throughout entire system. 2. Look at the fluid in the reservoir and ... Slowly to floor is often a symptom of a Master leaking/failing internally. It may not happen with engine off because the brake booster is not at play then. If you hit the brakes the vehicle stops properly But hold the pedal and it slowly depresses all the way to the floor. When the car is turned off ... The brake pedal falls to the floor without much resistance when the car is on. Is this a common problem with these cars? What could be the problem? It's either a vacuum leak or your booster is leaking. Booster runs off vacuum. Booster run brake systems usually require replacing the booster ... If your pedal goes all the way to the floor and you have no leaks, the master cyl is bypassing and needs to be replaced.