The situation when the steering wheel suddenly begins to vibrate when the car is moving is familiar to many drivers. This is not just an annoying factor that reduces the comfort of the trip, but also a serious signal of a malfunction in the control systems or chassis of the car. Ignoring such symptoms can lead to accelerated wear and tear of expensive parts and even create an emergency situation on the road.
Vibration can manifest itself in different ways: slight trembling at certain speeds, strong shaking during acceleration or beating, which is felt exclusively at the time of braking. Understanding the nature of these fluctuations is the first step to a proper diagnosis. In this article, we will discuss the main reasons why the steering wheel is hitting, and help you determine the source of the problem without wasting money on unnecessary parts.
Wheel imbalance and rubber problems
The most common reason why the steering wheel beats, especially at speeds between 80 and 120 km / h, is a violation of wheel balance. During operation on the inner side of the disk can stick dirt, get stuck in the tread stones or shift balancing weights. Even a slight change in the wheel mass at high revs causes centrifugal force, which is transmitted through the suspension directly to the steering rack.
It is also worth paying attention to the state of the rubber. Global shift of the wheel’s center of gravity often occurs due to tire deformation or uneven tread wear. If you have recently changed tires or repaired a puncture, the likelihood of an error in assembly or balancing increases many times over. In such cases, the vibration usually increases smoothly with increasing speed.
⚠️ Attention: Driving a car with heavily unbalanced wheels leads to rapid failure of the hub bearings and the destruction of the levers' silent blocks.
To eliminate the problem, you need to visit the tire fitting. The wizard will conduct a visual inspection, clean the disk from contamination and check the geometry of the wheel on the machine. If the beat persists after balancing, it is possible that the disc has a curvature that requires correction, or the tire itself has a production defect of the "hernia".
Wheel disc deformation
The second most common cause of vibrations are damaged wheels. Our roads are teeming with pits, hidden puddles or snow, and a heavy impact often leads to a curvature of the rim geometry. Even if the disc appears flat, microscopic deviations from the axis of rotation at high speeds turn into a tangible shaking.
Particularly susceptible to deformation die-plateThey may be able to change their shape when they are exposed to the heat, and they may be able to change their shape when they are reheated. Casting analogues are more fragile and with a strong impact can not only bend, but also crack, which creates a risk of loss of tightness and sudden descent of the wheel. Checking the geometry of the disk is best carried out on a special stand, where the difference in the beating on the radius and end will immediately be visible.
If the diagnosis showed significant deviations, the disk should be edited or replaced. Operating a car with an eight on the wheel is unacceptable, as this creates a constant impact load on the suspension elements. In some cases, the wheels help: if the vibration shifted to the body or changed the character, the problem lies in a particular wheel.
Try to swap the front and rear wheels. If the vibration has moved to the body or changed, the problem is precisely in the discs or rubber, not in the suspension.
Failure of suspension elements
If the wheel balancing is perfect, and the wheels are even, but the steering wheel still beats, you need to look for the reason in the chassis of the car. Worn-out suspension parts create backlashes that allow the wheel to walk in planes not provided for by the design. This causes chaotic fluctuations of the steering wheel, especially on rough roads.
First of all, the following nodes are subject to diagnosis:
- 🔧 Steering tips - when developing in the ball connection, a free course occurs, transmitting shocks from the wheels to the steering wheel.
- 🔧 Steering thrust - curved or backlash thrust violates the descent-shattering and stability of the direction of movement.
- 🔧 Silentblocks of leverage - rubber metal hinges eventually dry up and crack, ceases to extinguish vibrations.
- 🔧 Ball supports - a critical element, the backlash in which can lead to the separation of the wheel from the hub.
Diagnosis of the suspension is better carried out on the lift. The wizard sways the wheels in different planes and checks for backlashes in the connections. It often happens that visually whole anthers hide a fully developed mechanism. Replacement of worn parts is mandatory, after which adjustment of the angles of installation of wheels (fall-down) will be required.
Why is the suspension knocking?
Knocking and vibration often occur because worn-out Silentblocks stop holding the lever in a predetermined position. The metal begins to beat against the metal, creating a characteristic sound and transmitting shocks to the body.
Braking system problems
A special case is when the beating of the steering wheel occurs exclusively at the time of pressing the brake pedal. This is a classic symptom of brake disc problems. In intense braking, especially if the caliper is slightly pocked, the disc overheats at one point and then cools down. This leads to its warping and the appearance of the so-called "thermal deformation".
Surface. brake disc It ceases to be perfectly flat, becoming undulating. When rotating the pad rubs against the protruding parts of the wave, causing a pulsation of braking force, which through the hydraulic system and the steering rack is transmitted to the steering wheel. Visually, such a defect can be seen if you spin the removed wheel and look at the gap between the disc and the pad - it will "walk".
The solution to the problem is to replace the brake discs. The flow of discs is possible only if their thickness allows you to remove the metal layer without violating the strength characteristics. It is also worth checking the condition of the guide calipers: if they are acidified, the pad will not evenly press against the disk, causing its uneven wear.
| Symptoms. | Probable cause | Nature of vibration |
|---|---|---|
| Beating at 80-120 km/h | Wheel imbalance | Uniform vibration increasing at speed |
| Braking shaking | Brake disc curves | Pedal and steering pulsation when pressed |
| Vibration on irregularities | Wear of silentblocks/drawing | Chaotic impacts depending on the terrain |
| Spreading tremors (front-wheel drive) | Inner SRUS | Vibration under load, lost during the discharge of gas |
Defects of drive shafts and SRUS
On cars with front-wheel drive, drive shafts become a frequent cause of vibration during acceleration. Internal joints of equal angular velocities (SRUSS) tend to wear out, creating a backlash. When you give the gas, the load shaft is shifted in the worn-out part of the hinge, causing a beat that is transmitted to the body and steering wheel.
A characteristic feature of such a malfunction is that vibration appears under load. If you accelerate and release the accelerator pedal, the tremor can completely disappear. It is also worth examining the anthers of the SRUS: if they are torn and the lubrication leaks, the hinge will quickly fail. In some cases, the shaft may simply be curved after hitting the curb.
☑️ Diagnosis with steering wheel beat
Rare causes and complex cases
Sometimes the source of the problem lies deeper than it seems at first glance. Vibration can be caused by malfunctions of the engine or its supports. If engine-bag dried or torn, the motor begins to transmit its vibration to the body and steering rack, especially at idle speeds or when gassing. This is often accompanied by an extraneous sound in the engine compartment.
Another rare but possible reason is a violation of the geometry of the body after a serious accident. If the spars or mounting places of the suspension are displaced, the wheels will stand at incorrect angles, which causes " yaw" and vibration. It is also worth mentioning the poor-quality repair, when the replacement of parts used parts of low quality, not corresponding to factory tolerances.
⚠️ If after replacing all the suspension elements and wheels the problem has not disappeared, deep computer diagnostics and verification of the geometry of the body on the slipway are required.
Owners of cars with power steering should check the level of liquid GUR and the condition of the pump itself. Stifling the system or wear of the pump blades can cause pressure pulsations that feel like slight tremors on the steering wheel, especially when the wheels are rotating in place.
90% of steering problems are solved by high-quality wheel balancing or replacement of curved discs. Do not rush to change the expensive suspension without checking the wheel row.
Methods of self-diagnosis
Before you go to the service, you can conduct a primary diagnosis yourself. This will help you to describe the problem more accurately to the master and avoid imposing unnecessary services. Start with a visual inspection: check if there are any dirt, stones or missing weights on the disks.
Try to analyze the conditions of vibration:
- 🚗 At what speed does the beat start?
- 🚗 Does it depend on the quality of the road?
- 🚗 Does the vibration disappear if you release the gas or press the brake?
- 🚗 Does the vibration change after the wheels are moved?
You can also sway the car on the spot. Sharp jerks steering from side to side with a standing car can reveal backlashes in the steering tips (need an assistant who will keep his hand on the traction). However, remember that accurate diagnosis of the condition of the Silentblocks and ball supports can only be carried out by a specialist on the lift.
Can I drive with the steering wheel beating?
Driving with a strong vibration is dangerous. It accelerates wear of all car components, causes driver fatigue and can lead to unscrewing of wheel attachment nuts or breakage of steering.
FAQ: Frequently Asked Questions
Why does the wheel only hit at a certain speed?
This is a classic sign of wheel imbalance. Each wheel has its own resonant rotation frequency. When a certain speed is reached (usually 90-110 km / h), the centrifugal force of the unbalanced load coincides with the frequency of vibrations of the suspension, causing a strong vibration. With further acceleration, the frequency may change, and the beat will disappear.
Is it dangerous to ignore the light vibration of the steering wheel?
Yes, dangerous. Even light vibration indicates that the suspension and steering elements are affected by increased dynamic loads. This leads to accelerated destruction of the Silentblocks, hub bearings and steering tips. In addition, it reduces braking efficiency and controllability.
Could the steering wheel be due to the engine?
Yes, if the vibration is felt mainly at idle turns and when parking, and is also transmitted to the entire body. Most often this is due to worn cushions (supports) of the engine or triniomation of the engine (faulty candles, nozzles), when the engine works unevenly.
How often should you balance the wheels?
It is recommended to check the balance at each seasonal change of rubber. If you are actively operating a car on bad roads, the check should be carried out every 10-15 thousand kilometers. Balancing is also required after any tire repair or disk replacement.