What is the cause of the abnormal chassis noise when the vehicle crosses the bumpy road

Generally, it is caused by shock absorber problems, loose parts, and failure of the front and rear axles. Abnormal noise can be reduced by installing a chassis guard plate and tightening the suspension connectors. It is recommended to contact your local 4S store for inspection and maintenance.

1. Abnormal sound of disc brakes: when the vehicle is driving on a flat road at a low speed, there is an intermittent and irregular "rattling" sound at the axle part, and the sound will be slightly aggravated when the speed increases, but there is no change when going uphill and downhill and turning; When driving on uneven roads, the sound is aggravated, and the sound of pressing the brake pedal with your foot is reduced or eliminated. When stopping for inspection, you can hear an abnormal sound by rotating the wheels back and forth.

This is due to the damage, deformation and falling off of the brake shoe support plate, vibration damping spring plate or guide plate of the disc brake, which increases the gap between the brake shoe and the brake caliper support frame, and makes a sound when it hits each other. You can go to the repair station to repair the deformed parts and replace the parts that have fallen off.

Second, the front suspension ball head abnormal sound: when the vehicle is driving on the undulating road surface in a low-speed gear, the front axle part emits an uninterrupted "click" sound, the worse the road quality, the louder the sound, the sound intensifies with the increase of speed, and the front of the vehicle will be shaken left and right after parking. If the vehicle is driving on a flat road, there will be an intermittent and irregular noise on the front axle, such as the crash of steel breaking.

The gap between the ball head and the ball head seat becomes larger, and the looseness is severe. Because the ball head seat is a sealed structure and cannot be removed, it can only be replaced at the repair station in this case.

3. Abnormal sound of the front wheel shock absorber: On the flat road, you can slightly hear the "cooing" sound of the front of the vehicle, and the sound intensifies when turning sharp corners. When stopping for inspection, press and hold the front of the vehicle firmly to make it rebound up and down, and abnormal noises appear, and the greater the force, the louder the sound.

At the same time, it feels that the vehicle is inelastic and not soft. Vehicles are often driven on bad roads and are not properly maintained, causing oil leakage and damage to shock absorbers. At the workshop, this is done by repairing or replacing it depending on the severity of the damage.

Photo by Chen Fang1) @2019

1. Constant velocity universal joint abnormal sound: Constant velocity universal joint is commonly known as ball cage, and its main function is to transmit power and complete steering. If the constant velocity universal joint is seriously worn, and the vehicle turns while driving, there is an abnormal sound similar to "rattle and rattle", you only need to confirm which side the abnormal noise is, and then replace the constant velocity universal joint to solve it.

2. Abnormal sound of wheel bearing: The function of wheel bearing is to connect the vehicle and the tire. No matter how big the tire is, the connection between the vehicle and the tire is by a small wheel bearing, if the wheel bearing is damaged, it will cause the tire to deviate, or even the tire to fall off.

When the vehicle is driving, it emits a continuous abnormal sound similar to "buzzing", which is the alarm of the wheel bearing, and the faster the speed, the stronger the sound, if it is slightly damaged, there will be an abnormal sound when the direction is generally tapped.

3. Abnormal sound of exhaust pipe: abnormal sound of exhaust pipe is generally caused by rupture or leakage of exhaust pipe, and there will be "poof" noise after the vehicle starts. It may also be caused by the damage or blockage of the three-way catalytic converter, which is used to reduce the noise while purifying the exhaust gas.

The above is the introduction of the abnormal sound of the car chassis, I hope it will help you.

Hope, thank you!

Hello, I am your exclusive technician, attentive, careful, attentive to answer your car questions, for you to find the corresponding problem solutions, the car over the bumpy road noise is mainly the suspension problem, knock dong is shock absorption, balance bar boom two problems, this only replace the new shock absorber and balance bar boom, the replacement of ** has a relationship with the model, the ordinary single for a shock absorber to more than 600, a single for a boom more than 200, if it is a chirp is the triangle arm rubber sleeve problem, this replacement of a separate rubber sleeve, You'd better go to the pit station to test check this problem, and it is easy to judge.

Foreign objects such as children are stuck on the surface of the tire. If it feels like a chirping or crunching sound, it should be**loosened (generally the four doors are easy to appear) You have to listen carefully to it**, it is inconvenient to listen to it by yourself, so find someone to sit next to you.

What is the abnormal noise of the car chassis.

It is caused by general shock absorber problems, loose parts, and abnormal chassis noises caused by the failure of the front and rear axles. Installing the chassis guard plate and fastening the suspension connector can reduce abnormal noise. It is recommended to contact your local 4S shop for inspection and maintenance.

1.Disc brake abnormal noise: when the vehicle is driving at low speed on a flat road, it emits an intermittent and irregular "rattling" sound at the wheel axle, which will be slightly aggravated when the speed increases, but will not change when going uphill, downhill and turning; When driving on uneven roads, the noise increases, and the noise of pressing the brake pedal with your foot decreases or disappears.

When parking, abnormal noise can be heard by turning the wheels back and forth. This is because the brake shoe support plate, damping spring plate or guide plate of the disc brake is damaged, deformed and falling off, so that the gap between the brake shoe and the caliper support frame increases up and down, left and right, and collides with each other to make a sound. You can repair deformed parts at the workshop and replace fallen parts.

Two. Abnormal sound of the front suspension ball joint: When the vehicle is driving at low speed on uneven roads, the front axle will make a non-stop "click" sound.

The worse the quality of the road, the louder it will be, and it will increase as the speed increases. When parked, the front of the vehicle will shake from side to side, which will produce abnormal noise. If the vehicle is driving on a flat road, there will be intermittent, irregular and unusual noises on the front axle, such as the crash sound of steel breaking.

The gap between the ball head and the ball head seat becomes larger, resulting in severe loosening. Since the ball and socket are sealed and cannot be disassembled, they can only be replaced at the repair station in this case.

3.Abnormal sound of the front wheel shock absorber: On the flat road, the waiter can slightly hear the "cooing" sound in front of the vehicle, and the sound intensifies when making sharp turns.

When parking, press and hold the front of the vehicle hard to make it rebound up and down, and abnormal noise will appear, and the greater the force, the louder the noise. At the same time, it feels like the vehicle is not elastic and soft. Vehicles are often driven on bad roads and are not properly maintained, resulting in oil leaks and damage to shock absorbers.

At the repair station, this should be repaired or replaced, depending on the severity of the damage.

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Hello! Glad for your question.

Loose chassis generally occurs in older cars, when the car is driving in bad road conditions, the steering wheel will feel unstable, the bottom of the car will also come out of the abnormal sound, usually the old driver can feel the overall a little loose, when encountering such a situation, it means that the chassis may be loose, and the reasons for this situation are divided into several, only by understanding the reasons, can we better prevent this problem from happening.

The first reason is the aging of rubber parts, we all know that the elasticity of rubber is particularly good, which can buffer the friction between parts and reduce noise at the same time. However, this kind of thing has a lifespan, and it will age after a long time, and the elasticity is not as good as before, so the buffering capacity will decrease, resulting in abnormal noise in each part, so it is necessary to check these rubber parts regularly and replace them in time.

The second possibility is the reason for the shock absorber, the main role of this part is to inhibit **, when the car is driving in the dustpan section, it will have an impact with the road surface, and the shock absorber can well ensure the smoothness of the car, if the shock absorber is damaged, there will be a scoop phenomenon, so that the chassis is loose, so usually check the shock absorber, if there is a leakage to repair in time.

The third is the clearance of the parts, that is to say, the ball head may be loose, this part is like the joint of the human body, if the ball head is loose, there will be a large gap between the lever and other connected parts, if the gap is too large, when crossing some dustpan roads, the screws between the subframe and the suspension will be loose, then the chassis will become loose, so usually check these two parts. Thank you.

Because the problem of abnormal noise is relatively complex, it is difficult to judge directly without seeing the actual car. Shock absorbers, balance bar rubber sleeves, balance bar lifting lugs and other components, it is recommended that you check whether the vehicle shock absorber, balance bar rubber sleeve, balance bar lifting lugs and other components are equipped with the bottom guard, the noise caused by the bottom guard, or the tightness of the suspension connection. The above suggestions are for your reference only.

Hope it helps, hope!

Do you have an unusual noise when your car crosses a bumpy road? It's a problem here, use this method to make the abnormal noise disappear.

Today, I will explain to you the relevant knowledge about "what is the cause of chassis noise on bumpy roads". When driving on uneven ground, the slight bump on the ground and the chassis gurgling sound are mainly due to the failure problem of "aging or damage, deformation, increased clearance and loose gap of the stabilizer bar rubber sleeve". Need to drive the car to the 4S shop to find a professional auto repair master repair, most of the direct replacement of the stable so fixed rod small connecting rod can solve the problem of failure.

The stabilizer bar small connecting rod, also known as anti-roll bar and balance bar, is a kind of paving elastic element in automobile suspension. In order to improve the driving smoothness of the car, the suspension stiffness is generally designed to be relatively low, and the result is that the driving stability of the car is affected. In view of this, a horizontal rubber stabilizer bar structure is used in the suspension system to improve the stiffness of the suspension roll angle and reduce the body inclination.

The stabilizer bar is a torsion bar spring made of spring steel in the shape of a "U" shape that is placed horizontally at the front and rear ends of the car. The middle part of the shaft is hinged to the body or frame with a rubber bushing, and the two ends are connected to the suspension guide arms by rubber pads or ball pins at the end of the sidewall.

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