What causes the brake pedal of the Golf 7 to be hard to press down and the car unable to start?
1 Answers
The brake pedal of the Golf 7 being hard to press down and the car unable to start is due to a vacuum booster pump air leak or malfunction, or pressing the brake after the engine has been turned off. If the car's vacuum booster pump has an air leak or malfunctions, the force applied to the brake pedal is normally amplified by the brake booster pump. If it fails, the brake loses its power assistance, making the pedal hard to press down. Alternatively, pressing the brake after the engine has been turned off can also cause this issue, though this is not a malfunction. If the vacuum booster pump has an air leak or malfunctions, it can lead to brake drag, and in severe cases, brake failure, significantly impacting driving safety. Immediate repair or replacement of the vacuum booster pump is necessary. Additionally, a leaking or malfunctioning vacuum booster pump can cause heavy steering and steering noise, with the noise becoming louder at low speeds when turning at larger angles. If the brake is pressed after the engine is turned off, since the engine is not running, the brake can only rely on the remaining vacuum assistance. Pressing the brake will deplete the stored vacuum, making the pedal hard to press down. However, this condition will resolve itself once the vehicle is restarted, requiring no further action.
