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What are the reasons for the brake pedal being hard to press in an automatic transmission car?

2 Answers

McNatalie

07/29/25 10:07pm

Automatic transmission car brake pedal being hard to press is caused by: 1. The key fob battery is dead; 2. Failure of the car's vacuum booster pump; 3. Obstruction on the brake pedal; 4. Brake system failure. The brake system consists of a vacuum booster pump, master cylinder, wheel cylinder, brake pads, and brake discs. Methods of applying brakes under different circumstances are: 1. When the brake pedal is abnormal, use engine braking and shift to a lower gear; 2. In traffic congestion, press the brake pedal gently; 3. On rainy and muddy roads, lightly press the brake pedal repeatedly; 4. In emergency situations, press the brake pedal hard immediately and then release it slowly, followed by repeatedly pressing and releasing the brake pedal gently.

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McHolden

08/15/25 10:14pm

I found that the most common reason for the brake pedal being hard to press in an automatic transmission car is a problem with the vacuum booster system. This system relies on vacuum provided by the engine to assist braking. If the booster fails, the brake pedal will become as hard as a rock. If the engine isn't running, the loss of assistance is normal, but if this happens while driving, you should be alert to issues like vacuum leaks or insufficient brake fluid. For example, last time my friend's car had a cracked vacuum hose, causing air leakage and complete loss of assistance. Quickly check for leaks in the brake lines or air bubbles in the fluid, and pay more attention to these components during regular maintenance. A safety reminder: never force the car to keep driving—pull over and seek help from a professional to avoid accidents.

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