Automobile lower arm is also called automobile lower suspension, which is an important part of the car. Although the parts are small, it plays an important role in supporting the body. It forms the suspension system together with the shock absorber and spring. The following describes the role of the car's lower arm and precautions.

1. Cushion vibration. The function of swing arm is to cushion the vibration of the car during driving. The shock absorber is used to cooperate with the swing arm to cushion the vibration.

2. The materials of the swing arm are various, including aluminum alloy, cast iron, double-layer stamping parts and single-layer stamping parts. All kinds of materials have advantages and disadvantages. The toughness of the stamping parts is better, but the strength is not enough, and it is easy to fracture when impacted.

3. Rust proof. Usually we can check whether the swing arm is rusty. The position of the swing arm is in the parts connecting the front wheel tire and the center body of the car. It is easy to check. If rust is found, we must go to the 4S store in time to prevent fracture and accidents.

4. Prevent the chassis from scratching. When driving, we should pay attention not to take uneven roads as far as possible. Such roads are easy to scratch the ground, which will not only damage the chassis, but also easily cause damage to the lower arm and crack the lower arm. Lower arm injury prone to steering wheel jitter, deviation and other phenomena.

5. Replace it in time. If there is a problem with the lower arm, we should replace it in time, otherwise serious traffic accidents will occur. The service life of the lower arm of each car is different. We need to replace it according to the maintenance manual or the suggestion of the 4S store.

6. Four wheel alignment. After replacing the lower arm, we need to carry out four-wheel alignment. The purpose of four-wheel alignment is to prevent the vehicle from running off the track or eating tires.