* A soft or spongy brake pedal. This is the most common symptom of a bad brake master cylinder. When you press on the brake pedal, it will feel soft or spongy, and it will not provide as much stopping power as it should.
* The brake pedal goes to the floor. If the brake master cylinder is completely failed, the brake pedal will go all the way to the floor when you press on it. This is a very dangerous situation, as you will have no way to stop the car.
* The brakes are applied unevenly. If the brake master cylinder is not functioning properly, the brakes may be applied unevenly, causing the car to pull to one side when you brake.
* Leaks under the car. If you see a leak under the car, it could be a sign that the brake master cylinder is leaking. This is a serious problem, as it can lead to brake failure.
If you experience any of these symptoms, it is important to have your car inspected by a qualified mechanic as soon as possible. A bad brake master cylinder can be a serious safety hazard, and it should not be ignored.
