What is the reason why the car brake cannot be pressed down?
2 Answers
Car brake cannot be pressed down because the vacuum booster pump has failed. After this failure occurs, the vacuum booster pump should be replaced. The car brake system, also known as the car braking system, refers to the special braking mechanism installed on the car to technically ensure safe driving and improve the average speed of the car. The function of the car brake system is: to force the moving car to decelerate or even stop according to the driver's requirements; to keep the parked car stable under various road conditions (including on slopes); to maintain a stable speed for cars driving downhill.
As someone who has repaired cars for many years, I've encountered the issue of the brake pedal being hard to press several times. The most common cause is a failure of the brake booster, which relies on vacuum to reduce pedal effort when the engine is running. If it fails, the brakes become stiff. Insufficient brake fluid or air in the system can also cause this—low fluid levels require checking for leaks. Problems with the master cylinder or blocked lines can prevent pressure from being transmitted. I remember one time a customer was driving when suddenly the brakes wouldn't press, nearly causing an accident. It turned out to be a leaking brake line due to aging. For safety, don't force the pedal if this happens—pull over to check fluid levels or call a tow truck immediately. Don't ignore small signs, like unusual pedal feel—addressing issues early saves hassle and money. If the pedal is hard when the engine is off, that's normal, but if it remains stiff after starting, be cautious.
