- Brake pedal feels spongy or soft. This is a classic sign of a failing master cylinder. When you press on the brake pedal, it should feel firm and responsive. If it feels spongy or soft, it means that the master cylinder is not able to create enough pressure to engage the brakes.
- Brakes do not engage. If the master cylinder is completely failed, the brakes will not engage at all. This is a very dangerous situation, and you should not drive your car if this happens.
- Brake fluid leak. If the master cylinder is leaking brake fluid, it will not be able to create enough pressure to engage the brakes. You may see brake fluid leaking from the master cylinder, or you may notice a puddle of brake fluid under your car.
- Low brake fluid level. A low brake fluid level can cause the master cylinder to fail. If the brake fluid level is low, it is important to add more brake fluid and then inspect the master cylinder for leaks.
If you experience any of these symptoms, it is important to have your master cylinder inspected by a qualified mechanic as soon as possible. A failing master cylinder can be a very dangerous safety hazard, so it is important to address it as soon as possible.
