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Why does the brake suddenly become hard?

2 Answers

VonChase

07/24/25 6:03pm

There are several main reasons why the brake suddenly becomes hard: 1. Problem with the brake booster pump: If the brake suddenly becomes hard while driving, it may be caused by a vacuum tube leak or blockage in the brake booster pump. In this case, you should stop the car immediately for inspection and replace it if necessary. 2. Foreign objects adhering to the brake pads or calipers: If there are foreign objects stuck to the brake pads or calipers, the friction from these objects during braking can also create a sensation of the brake becoming hard. In this situation, simply cleaning them will resolve the issue. 3. Vehicle ABS system intervention: When the vehicle performs an emergency brake, the ABS system intervenes in the braking system to prevent wheel lock-up and loss of control, which can cause the brake pedal to have a rebound effect. This is a normal phenomenon, and gently pressing the brake again will restore normal operation.

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Frederick

08/11/25 9:58am

I remember that time when I was driving and the brakes suddenly became stiff, feeling like they wouldn't budge, which gave me quite a scare. This is usually caused by a problem with the brake booster, such as a vacuum pump or a leak in the tubing, which causes the brakes to lose their normal power-assist function. Additionally, if you press the brakes after the engine stalls, the booster can't retain the vacuum, making the brakes stiff. Insufficient brake fluid or air in the system can also lead to this condition due to inadequate hydraulic pressure. I immediately pulled over and checked the brake fluid reservoir—it was too low. Later, I discovered that the booster's sealing ring had aged and was leaking. This incident taught me that it's essential to regularly check the brake fluid and the booster system, especially in older cars that are prone to oil and air leaks. If you ever encounter abnormally stiff brakes, don't hesitate—pull over to a safe spot immediately and call for help. Forcing the car to drive could lead to a major accident.

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