Vanishing Brake Pedal Discover the Reasons Behind Its Descent

My brake pedal feels normal (resistance at about half travel), until I push harder than I usually do, then it feels like it's going over a hump and drops to ... If the brake pedal touches the floor, it typically means your brake master cylinder is going out. There is a hydraulic seal in the master cylinder that is ... A bad power brake booster could make the brake pedal go to the floor only when the engine is running, which is the primary issue that I am experiencing. 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. The brake booster or master cylinder might be going out. Look around there and make sure the vacuum hoses going to the booster are good. The brake peddle is firm and at the top when the engine is off but sinks to the floor when you start the engine. Start at the master cylinder, loosening the brake lines and bleeding from there. Pump it up, hold it down, bleed. If there's air there, it takes a while. My braking pedal sometimes goes to floor during driving, mainly when I'm in a traffic jam and using the brakes actively. The Ford dealer said it could be the master cylinder or an ABS module. My question is, can you trouble shoot the Abs module and Master cylinder and not just ... 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.