Why is the brake hard and unable to stop?

1 Answers
Jones
07/30/25 3:51am
The reasons for a hard brake and inability to stop include worn brake pads, air in the brake fluid, deteriorated brake fluid, brake fluid pipe leakage, stuck brake caliper not returning, worn brake master pump leather cup with air leakage, and malfunctioning ABS pump. Since a hydraulic brake system is used, when the engine is turned off, the hydraulic pump driving the hydraulic brake does not work, causing a sharp increase in brake damping, which is reflected in the pedal as it becomes very heavy and hard. Below are the standards for replacing brake pads: 1. Thickness: The normal thickness of brake pads is about 10mm, and they should be replaced if below 6mm. 2. Sound: If the car frequently makes abnormal noises during braking, it indicates severe wear of the brake pads and they should be replaced. 3. Pedal feel: When the brake pads are severely worn, their braking force decreases, so symptoms of weak braking will appear when stepping on the brake, and the brake pads should be replaced promptly.
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