If your vehicle has soft, squishy brakes that make it hard or slow to stop your car, or if the brake pedal continues to move to the floor with the vehicle stopped, there might be a problem with a part in the braking system, like the brake master cylinder. This article and video reviews common bad master cylinder symptoms, how to tell if the brake master cylinder is the cause of squishy brakes, how to replace the brake master cylinder correctly, and what other parts to check in the braking system if you notice these symptoms.