1. The brake pedal becomes harder to press

If the brake vacuum pump fails, the brake pedal may become harder to press. This is because the brakes rely on the brake vacuum pump to generate enough vacuum force to function properly. If the brake vacuum pump cannot provide enough vacuum force, the brake pedal must be depressed with greater force.

2. Abnormal noise from the brake pedal

In addition to being harder to press, the brake pedal may also make odd noises. This could indicate some sort of problem with the brake vacuum pump, such as a leak or other malfunction. If not addressed in time, these problems can cause the brake system to not work properly.

3. Brake failure

In the worst case, a malfunctioning brake vacuum pump can cause complete brake failure. When this happens, take immediate emergency measures to stop the vehicle to avoid any accidents.

4. Observe the vacuum pump

Another way to judge is to observe whether there is a problem with the vacuum pump itself. Check whether there is any grease leakage on the surface of the vacuum pump body. If there is, it may be caused by the wear of the oil seal; if the piston or valve of the vacuum pump is damaged, it may also cause the brake to fail.

If you notice any of the above, be sure to take your vehicle to a professional facility for inspection and repair immediately. After all, the braking system is an important part of ensuring driving safety. If it fails, it will cause great harm to driving safety.