Braking pump is also known as the brake booster pump. During a braking process, It drives movement of the diaphragm by means of vacuum operation, causing the push rod on the diaphragm to act via a linkage device, thus increasing the force exerted by the driver on the brake pedal.

Symptoms of a failed braking pump:

1. Poor braking performance or no response to braking operation;

2. There is visible oil leakage at the external connection of the vacuum pump;

3. The brake pedal returns slowly or fails to return;

4. Abnormal sound can be heard after the brake pedal is pressed;

5. The car deviates from its direction or vibrates during braking;

6. The brake pedal feels soft when pressed.