What Causes Hard Brakes?
1 Answers
Hard brakes can be caused by the following reasons: 1. Insufficient brake booster assistance: First, check if the vacuum tube of the brake booster is clogged. 2. Vacuum-related issues: Factors affecting vacuum include cracks in the atmospheric valve seat, fatigue damage to the diaphragm, cracks or failure of the vacuum valve seat, and malfunctioning vacuum hose valves. 3. Free travel issues: When a driver presses the brake pedal, braking does not start immediately but has a buffer time for a more comfortable feel. After the free travel ends, as braking enters the effective travel phase, the pedal force is transmitted through the brake pipeline system to each wheel. As the pedal force gradually increases, the driver's feel of the pedal also becomes heavier, and the vehicle speed slows down accordingly. No free travel or insufficient free travel can lead to hard brakes or excessive pedal force. 4. Jump value and jump point issues: From the design perspective of the booster, the jump value is not only a significant cause of hard brakes but also a quantitative indicator of hard braking. 5. Gap between the valve plug and the rubber reaction disc: Under normal conditions, both the atmospheric valve and the vacuum valve of the vacuum booster are closed. When the driver presses the brake pedal, at the moment the vacuum valve closes and the atmospheric valve opens, there is a gap between the valve plug and the rubber reaction disc. This gap value affects the jump value.