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Why is the brake pedal hard?

2 Answers
Haven
07/24/25 10:57am
The reason for a hard brake pedal is either a vacuum booster pump leak or malfunction, or stepping on the brake after the engine is turned off, which is also related to the brake booster pump. Here is an introduction to the brake booster pump: 1. Definition: The brake booster pump, commonly known as the brake booster. 2. Principle: During the braking process, it controls the vacuum entering the booster pump, causing the diaphragm to move. Through a linkage device, the pushrod on the diaphragm assists the driver in stepping on and pushing the brake pedal, thereby amplifying the force applied by the driver. 3. Function: It utilizes the principle of air intake during engine operation to create a vacuum on one side of the booster pump, generating a pressure difference compared to the normal air pressure on the other side. This pressure difference is used to enhance the braking thrust.
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McAnthony
08/11/25 5:57am
I've always been a car enthusiast and usually fix minor issues myself, but don't take sudden brake stiffness lightly. The most common cause is a problem with the brake booster system, such as a failed vacuum booster pump. This component normally helps you brake effortlessly, but once it fails, the pedal becomes as hard as stepping on a rock. Insufficient brake fluid or leaks, as well as air entering the system, can also cause a loss of pressure, making braking laborious. The last time I encountered this issue, I nearly had an accident on the highway. So, if you notice anything unusual, pull over immediately to check the fluid level. Never force yourself to keep driving—take it straight to a professional shop for inspection and repair. Safety comes first. Regular maintenance of the booster pump and brake lines can prevent a lot of trouble.
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