The wear process of auto parts can be divided into three stages: the first stage is the running-in period of the parts, the second stage is the normal working period of the parts, and the third stage is the accelerated wear period of the parts.

Run-in period of parts: The run-in period of a car is actually a transition period for the car to go to normal use. During this period, the parts with uneven friction surface are worn away, and a relatively smooth, wear-resistant and reliable working surface is gradually formed to withstand normal working loads. At the same time, through running-in exposure and elimination of defects in production or repair, the failure rate during normal use is basically stabilized. The quality of the break-in period determines the service life of the vehicle.

The normal working period of the parts: the wear of the parts during the normal working period belongs to the natural wear, and the degree of wear depends on the structure, use conditions and use conditions of the parts. Fair use will extend normal working hours accordingly.

Parts accelerated wear period: also known as the extreme wear period, after the car enters the extreme wear period, the wear speed is accelerated, the car often breaks down, the maintenance cost increases, and the use cost increases.

Therefore, only by taking practical maintenance measures according to the wear pattern of the parts, such as regular inspection, replenishment, lubrication, adjustment or replacement of preventive work, can the parts be kept in good technical condition.