故障现象一辆2008款丰田凯美瑞车,行驶里程为12万km。车辆行驶时右前部有异响,在颠簸路面上时响声特别明显;高速(80 km/h～120 km/h)行驶制动时,车身及转向盘抖动严重;倒车时制动有“咯噔、咯噔”的响声。故障诊断经试车发现,上述异响确实存在。根据维修经验,车辆异响多是由以下原因造成的。(1)车辆底盘因碰擦导致部件变形、松动而出现异常摩擦。(2)制动块产生硬结焦化,在制动时与制动盘硬性挤压;制动盘变形或装配不当;制动块与制动盘接触面积过小等。 Trouble phenomenon A 2008 Toyota Camry car, mileage of 120,000 km. When the vehicle is running, there is abnormal noise on the right front part and the noise is particularly obvious when it is on the bumpy road. In the high-speed (80 km / h ~ 120 km / h) driving braking, the body and steering wheel shake seriously; , Slightly 噔 "sound. Fault diagnosis by the test car found that the above abnormal sound does exist. According to the maintenance experience, the more the vehicle noise is caused by the following reasons. (1) The chassis of the vehicle is deformed and loose due to rubbing, causing abnormal friction. (2) The brake pads are hard coked, and are hard to be squeezed with the brake disc during braking; the brake disc is deformed or improperly assembled; and the contact area between the brake pad and the brake disc is too small.