The question of the number of bearings in the design of a modern car often puzzles beginners, since the answer directly depends on the type of suspension and drive scheme. If we talk about the classic layout, where the front axle is controlled and equipped with McPherson racks, then in the front of the car there are usually two. However, if your car has a similar type of rear independent suspension, their number can double, reaching four pieces per body.
Understanding that, How many bearings are in the carIt is critical for proper diagnosis of knocks and budgeting for repairs, as these elements are subject to enormous loads. They connect the shock absorber with the body, taking on the bumps from the roughness of the road and ensuring a smooth rotation of the shock absorber rod along with the wheel. Ignoring their condition can lead to accelerated wear of rubber and even loss of handling at high speeds.
In this article, we will analyze the device of the node in detail, consider the symptoms of its failure and answer the question whether it is necessary to change them with a pair or you can limit yourself to one replacement. Support bearing It is not just a metal ring, but a complex mechanism that combines the functions of a rolling bearing and an elastic damper. The destruction of this element occurs gradually, but the consequences can be sudden and unpleasant for the driver.
Design and location of the unit in suspension
To understand exactly where to look for these parts, you need to consider the design of the front suspension type McPherson, which is the most common in the modern automotive industry. In this scheme. shock-stack the upper part is attached directly to the car body through a special unit, which is called the support. Inside this support, between the cup of the body and the top cup of the spring, is the bearing itself.
The main task of this node is to ensure the free rotation of the shock absorber rod along with the swivel fist when you turn the steering wheel. At the same time, it must extinguish vibrations transmitted from the road to the body, so the design often includes rubber metal elements. Support bearing It perceives both axial and radial loads, which makes its work in extreme conditions constant.
The location of the node is usually hidden under the hood, in a niche called a “glass”. You can get to it by removing a plastic decorative lining or a toad that covers the space at the windshield. It's in this place, in the top. shock-stack, and there is a main interaction of the movable parts of the suspension with a fixed body.
⚠️ Warning: When diagnosing or trying to replace a support bearing, do not unscrew the shock absorber rod nut in any case, unless the spring is compressed with special screeds! The release of energy from the compressed spring can lead to severe injuries and even death.
In vehicles with multi-link suspension, the design may differ, and there the role of the bearing may be performed by a separate unit or its functions may be distributed among other elements. In the vast majority of mass-produced vehicles, such as Ford Focus, Volkswagen Polo or Lada VestaIt is the scheme with an integrated bearing in the support.
When buying new bearings, always pay attention to the presence of nuts in the set. Old fasteners often have broken threads or lost elasticity, which is unacceptable for safety.
Symptoms of malfunction and diagnostic methods
Determine that bearing It requires replacement, can be by the characteristic sounds and changes in the behavior of the car. The first and most obvious sign is the appearance of extraneous noise when turning the steering wheel in place or at low speed. The sound may resemble a crunch, creak or a thud that is localized at the top of the front wheel arches.
Diagnosis can be carried out independently without lifting the car on the lift. To do this, it is enough to open the hood, ask the assistant to actively twist the steering wheel to the left and right, and at this time put your hand to the turns of the spring or the top cup of the rack. If you feel a characteristic vibration or hear a crunch transmitted through metal, then bearing It's worn out and needs replacement.
An indirect sign of malfunction can be a deterioration of course stability. The car can become less responsive to steering commands, there is a small backlash or “vatality” in the control. Sometimes drivers notice that when passing irregularities at speed, the impact is transmitted to the body harder than usual, which indicates that the rubber part of the support or the bearing itself has ceased to perform the damping function.
It is worth noting that the symptoms may be similar to signs of wear and tear of other elements, such as steering tips or levers Silentblocks. Therefore, it is important to conduct a comprehensive check. If you hear a knock from the bottom, not from above, the problem is not bearingIt's in ball poles.
Do you need to change a couple or is one enough?
One of the most common questions that arise when a fault is detected is if it knocks on one side only. How many bearings Do I need to buy? Technically, if the diagnosis has confirmed wear on one side only, the replacement of one element is permissible. However, auto parts manufacturers and experienced mechanics strongly recommend changing them with a pair, especially if the mileage of the car is significant.
The logic is simple: the operating conditions of the left and right sides are identical. If one bearing has exhausted its life, the second one is likely to be in a similar state, even if it does not emit sounds yet. The difference in resource between the new and old element will lead to uneven operation of the suspension, which can cause accelerated wear of the newly installed part.
In addition, when replacing one bearing You risk returning to the service after a few thousand kilometers for a second procedure that will require the same work costs. Disassembly of the suspension unit is a time-consuming process, and it is economically inexpedient to perform it twice to replace adjacent parts.
⚠️ Note: When replacing bearings, be sure to check the condition of the anthers of shock absorbers and breakers. These consumables are often bundled or inexpensive, but re-installation from old parts is not acceptable.
If you are changing shock absorbers, then replacing the bearings and support cups is a must. Installing old bearings on new shock absorbers will deprive you of the warranty on the new unit and can lead to its rapid failure due to distortions or backlashes in the old support.
Replacement technology and necessary tools
Replacement bearing It requires a certain set of tools and skills. First of all, you will need a jack, a balloon key, a set of heads and rattles, as well as special screeds for springs. Without screeds, work is strictly prohibited due to the high risk of injury.
Work begins with the loosening of wheel bolts and lifting the car. After removing the wheel, it is necessary to disconnect the brake hose from the rack (if it is fixed on it), unscrew the nuts that attach the rack to the rotary fist, and disconnect the steering tip. The rack is then removed from the wheel arch entirely.
The next stage is the most responsible. The rack is set on a flat surface, screeds are put on a spring and begin to gently compress the turns until they stop pressing on the supporting cup. Only after that you can unscrew the central nut of the shock absorber rod, which holds the entire structure together with the bearing-bearer.
☑️ Tools for replacement of bearing support
After removing the old support and bearing, all seats must be thoroughly cleaned of dirt and corrosion. Installation of the new set is done in reverse order. Particular attention should be paid to the correct positioning of the support, since on many cars it has a direction (left / right) or marks for proper installation.
Comparison of bearing types
In the auto parts market, you can find various designs of supports, which may differ in the type of bearing used and the method of attachment. Understanding these differences will help you choose the most suitable option for your driving style and operating conditions.
| Type of design | Resource (km) | Noise level | Cost |
|---|---|---|---|
| rubber-sleeve bearing | 40,000-60,000. | Low. | Budgetary |
| plastic-sleeve bearing | 60,000-80,000. | Medium. | Medium. |
| Reinforced ball bearing | 80-100 thousand. | High-pitched | Premium |
| Support assembly (bearing + cup) | Depends on the type. | Depends on the type. | High-pitched |
Choosing between a separate bearing and a support in the assembly, it is worth considering the condition of metal cups. If they have traces of corrosion or deformation, saving and changing only the insides does not make sense. Support bearingA cup mounted on a curved cup will not live long.
Why is the new bearing buzzing?
Sometimes, after replacement, there may be a hum, which passes through 500-1000 km of run. This is due to the laundry of new details. If the sound is not lost, the assembly technology may have been broken or poor-quality lubricant used.
The impact of road conditions on the resource details
Resource bearing It depends on the quality of the roads you have to travel. In conditions of perfect asphalt, these parts are able to walk more than 100 thousand kilometers, but in the realities of domestic roads their service life is often reduced to 30-40 thousand.
Especially destructive for suspension are sharp temperature changes in combination with reagents. In winter, water, falling into the microcracks of the rubber support, freezes and expands, destroying the structure of the material. In summer, high temperatures accelerate the aging of rubber components, making them tough and brittle.
The driving style also plays a role. Fans of fast driving on a primer or frequent assault of curbs should be prepared for the fact that bearings Their cars will require replacement of the average statistical indicator. Aggressive braking and sharp turns increase the lateral load on the knot.
⚠️ Warning: After replacing the bearings and any work affecting the suspension elements, be sure to make the wheels fall-down. Violation of the angles of the wheel installation will lead to the “eating” of rubber in one season.
To prolong the life of the node, it is recommended to regularly wash the under-hood space, removing accumulated dirt and chemical reagents from the “glasses”. Cleanliness in the engine compartment allows you to notice the flow of shock absorbing fluid or mechanical damage to the suspension elements in time.
The average service life of a bearing is 40-60 thousand kilometers, but with aggressive driving and bad roads, it can be reduced by half.
Frequently Asked Questions (FAQ)
Can I drive if the bearing is knocking?
You can drive with a faulty bearing only to the nearest service in calm mode. Long-term operation will lead to the destruction of the support, which can cause jamming of the suspension or detachment of the shock absorber, which is fraught with loss of control and accident.
Why does it only crunch on cold?
Crunch on cold is often associated with thickening of the lubricant inside the bearing or loss of elasticity of rubber elements. After heating the node, the lubricant becomes thinner and the sound may disappear, but this does not mean that the problem has disappeared.
Do I need to change the mounting bolts?
On many modern cars, the bolts of the shock absorber attachment to the swivel fist are disposable (stretch). Their reuse can lead to weakening of the connection, so if possible, they are better replaced with new ones.
Which company is better to buy bearings?
It is best to choose original parts or proven analog brands such as Lemforder, Sachs, KYB or SNR. Cheap Chinese analogues often have a small resource and can start making noise after 5,000 kilometers.
Does the bearing affect the beating of the steering wheel?
A heavily worn bearing can create a backlash that can theoretically be transmitted to the steering wheel, but more often the beating of the steering wheel is due to a wheel imbalance or a malfunction of the steering tips. However, the impact of the support cannot be completely excluded.