Because the brake disc has been deformed in a strict sense, this is about dynamic balance, as some people say. I've only heard that tires have dynamic balance and brake discs need dynamic balance. In fact, the brake disc also needs dynamic balance, but the requirement of dynamic balance of brake disc is even stricter than that of tire. To understand the vibration of the brake, we must first understand the principle of automobile braking: in short, we step on the brake and drive the brake pedal to move the master cylinder back and forth through the vacuum booster to pump up the interior.

In case of emergency braking, the ABS braking anti-lock system will intervene, which will adjust the pressure of the brake wheel cylinder, prevent the wheel from locking, prevent the vehicle from turning and avoid road obstacles caused by the wheel locking. The pressure in the brake oil pipe will change rapidly. When a manual-shift vehicle needs to step on the clutch pedal to start in gear, if the clutch is in a semi-linkage state and the vehicle does not want to start, the right foot will lightly step on the brake pedal. At this time, because the clutch is in a semi-linkage state, the vehicle will hold the force under the action of braking, the brake pedal will shake, and the steering wheel will shake. Usually brake discs.

Generally speaking, the brake pedal is fixed on the firewall between the cockpit and the engine compartment, that is, it is integrated with the car body. It is inevitable that there will be * * * vibration. If NVH performs well, some manufacturers can minimize the vibration. Some manufacturers may not pay much attention to this problem, resulting in serious pedal vibration. In semi-linkage, the clutch is connected and starts to transmit power. Because the right foot is stepping on the brake, or the handbrake is not released, the clutch slips and the power is held there, so the whole car will shake slightly. The foot is still stepping on the brake pedal, which is the "culprit" that causes the vehicle to shake.

First of all, rule out a normal phenomenon, that is, the brake pedal will rebound under the emergency braking of ABS system. In addition, if the fault is confirmed, the brake disc should be regularly checked for serious wear and out-of-tolerance section runout, and the faulty parts should be measured and replaced.