The car chassis is loose to know how much.
Any item has its service life, but the service life is closely related to the use method. The same is true of the car, the same year to buy a car, the same mileage, but the situation is very common, the car in use for a period of time or to reach a certain number of kilometers after the chassis will always appear some strange strange sound. What are the underlying factors that cause these problems? As long as the car is in use, the loose chassis is a barrier that can never be passed, but the time is different. Good car habits can reduce the probability of the chassis loosening in advance, of course, we can not be too cautious, after all, the car is not so fragile. Basically, after all cars exceed 100,000 kilometers, the performance of the chassis will be significantly reduced, and there will be various abnormal sounds. Chassis is an important part of the bearing body, not only support the body but also need to correspond to the impact of various road surfaces, over time, rubber parts, spring parts, torque buffer parts, etc., will naturally degrade, which is a reasonable natural phenomenon. Important parts of the chassis: stabilizer rod bushing, inclined rod, lower arm, hub bearing, tie rod end, shock absorber, brake pad. The chassis parts will make various sounds after loose aging, and how to judge the specific analysis is as follows.
Stabilizer rod bushing: The role of the stabilizer rod is to inhibit the distortion and tilt of the body when it bends left or right, and the stabilizer rod itself does not produce any abnormal sound. It is mainly due to the aging and wear of the bushing for a long time, and the stabilizer rod makes a squeaky/squeaky sound due to extrusion. Inclined rod: The inclined rod is the rod that connects the stabilizer rod to the lower arm and shock absorber. Constantly moving up/down and left/right back and forth during normal driving, the sound of the inclined bar and the sound of the stable bar bushing being worn is roughly the same. It can be moved by hand from under the car or hit with a rubber hammer. If it rattles, it can be confirmed that it is the sound of the inclined rod. Lower arm: The lower arm is an important part of the support tire, which is divided into upper control arm, longitudinal control arm, lower front control arm and lower rear control arm. Most cars connect the left and right axles to the rear axle, usually using only the left and right front wheels. If the tire is shaken, the rubber part in the middle will move, but if it is normal, it will not move. If it is worn, it will hear a "click" sound when driving.
Hub bearings: Bearings are applied to all four wheels. When the bearing is worn, the sound similar to that of a motorcycle can be obviously heard nearby when driving. Due to the increased resistance of the rotating parts, fuel efficiency is reduced (increased fuel consumption). The sound does not go away even if it is oiled, so the only way to eliminate it is to replace it.
Tie rod ends: Tie rod ends are connected to both ends of the power steering gear box and are connected to the steering arm so that the tire can be moved from side to side. The connecting part is a spherical joint to cope with the vertical vibration of the body. Since it is connected to the steering wheel, there will be noise when operating the steering wheel, but these are not important and can be ignored. If the steering wheel is not applied when it is not operated, it will still make a "squeaky" sound in the free state, indicating that it is likely to fall off, and it will cause direction failure in serious cases. Shock absorber: shock absorber is simply a piston structure, full of oil, compression or tensile need a lot of force, known as the damping force, and when the vehicle is bumpy is to rely on the damping effect of shock absorption quickly consume the impact, so that the body can restore stability as soon as possible. After the shock absorber is broken, the car will have a little bump, and this feeling will also aggravate the feeling of "loose chassis". Shock absorber is a very important part to improve the quality of the ride. This is the most important part of the suspension. It is mounted next to the tire, and there are four of them. There are hydraulic and air, but most cars are hydraulic. The noise of the shock absorber is caused by oil leakage/lack of oil in the shock absorber. When there is a lack of oil, the internal cavity of the shock absorber is air, which, unlike oil, is easy to escape, so if the shock absorber is pushed in the case of an empty cavity, it will shrink sharply to accommodate the oil. When the vehicle is found to be obviously redundant, it is recommended to go to the repair shop in time to check and replace.
Brake pads: Brake pads are the parts that hold the rotating rotor inside the wheel. If the rotor stops, the car will stop. When braking a vehicle to a stop, the friction of the brake liner is very strong. It must be replaced after driving about 50,000 km in extreme conditions. If it is not replaced in time, there will be a very harsh friction sound and brake failure may occur in serious cases.
The chassis becomes loose and abnormal, with the above parts have an absolute relationship, we can also find that these parts basically have a common point, in addition to the brake pads other parts contain rubber products. The advantage of rubber products is that there is no sound friction, the disadvantage is that it will naturally age, and to a certain number of years, it will lose elasticity, bring all kinds of noise, and seriously affect the balance of the car chassis. The chassis becomes loose and abnormal noise for these reasons can basically be said to be inevitable, but it does not hurt, we need to pay more attention to the daily use of the car.
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