What Causes Brake Shaking at High Speeds?
2 Answers
Brake shaking may be caused by the following reasons: 1. Brake system failure: If the car shakes whenever the brakes are applied while driving, the problem is likely with the brake discs. If the brake discs are not properly maintained during use, they may become deformed, causing rhythmic shaking during braking. If shaking only occurs during high-speed braking, brake disc deformation can be largely ruled out. 2. ABS anti-lock system failure: If the vehicle only shakes during high-speed braking, the issue may lie with the ABS anti-lock system. Some drivers may have experienced this: during emergency braking on icy or snowy roads, the brake pedal continuously rebounds, and the vehicle shakes along with it. This is caused by the ABS system's braking efficiency failing to meet braking demands. 3. Faulty components such as the ABS pump, sensor, or fixed shaft: High-speed driving requires greater braking force. If components like the ABS pump, sensor, or fixed shaft are aging or have poor contact, it can lead to brake shaking. Shaking during high-speed braking may also be related to aging or wear in the suspension system. For example, if the kingpin develops gaps due to wear, it can intermittently swing during intense braking, transmitting this movement to the vehicle body and causing high-speed brake shaking. 4. Incorrect wheel dynamic balance parameters: However, this type of shaking is related to the vehicle's speed, and the vehicle will shake regardless of whether the brakes are applied. If shaking only occurs during braking, dynamic balance issues can be ruled out.
Last time I was on the highway, the car shook violently when braking, like riding a horse. The main reason was probably warped brake rotors—high-speed braking generates high temperatures causing uneven rotor surfaces. Uneven brake pad wear or sticking calipers can also cause shaking. Remember to check the suspension system, such as whether the shock absorbers or wheel hub bearings are loose, otherwise high-speed driving becomes unstable and dangerous. I previously went to a repair shop and spent some money resurfacing the rotors to fix it. Usually, avoid continuous hard braking, especially when carrying heavy loads. Preventive checks are crucial—regularly inspect brake pad thickness and rotor surface condition to ensure family travel safety.
