What Causes the Brakes to Suddenly Become Hard and Unable to Start?

1 Answers
McBrianna
07/30/25 8:18am
The reasons why the brakes suddenly become hard and unable to start are as follows: 1. The brakes were pressed before the engine was turned off. The car's braking system works best when the engine is running, and the brake booster is the key component that amplifies the force applied to the brake pedal. When the engine is off, the brake booster stops functioning, and typically, pressing the brake pedal three times will deplete its remaining vacuum force. 2. The car's brake booster is leaking or malfunctioning. If you haven't pressed the brake pedal after turning off the car, or if you notice that the brake pedal is hard to press while driving, it is likely due to a faulty brake booster.
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