Uneven and rapid wear
- Uneven and rapid wear of the tread can be caused by various reasons, such as too low or high air pressure in the tire, increased wheel torque, frequent use of the brake system or incorrect wheel alignment. When adjusting the wheel alignment angles on the basis of rapid or uneven tire wear, it is necessary to set the minimum allowable wheel alignment according to the technical characteristics
- It is recommended to rearrange the wheels in the following cases: the wear of the front wheels is different from the rear; uneven wear of the tread on any wheel in the transverse direction; uneven wear of the front wheels; uneven rear wheel wear
- It is recommended to check the wheel alignment in the following cases: unequal wear of the front wheels; uneven wear of the tread on any wheel in the transverse direction; The front wheel tread has wear zones with one-sided sharp ridges along the treads or along the edges of the tread blocks
Lateral vibrations of the body
- Lateral vibrations of the front and / or rear of the body are caused by the uneven location of the steel belt of the radial tires relative to the plane of symmetry of the tire. Another cause may be increased wheel or tire axial runout
- Lateral vibrations are most pronounced at low vehicle speeds from 8 to 48 km/h. They can also impair the smoothness of the car and at high speeds in the range from 80 to 120 km/h
- The vehicle may be subjected to a road test to ascertain the location of the tire that causes lateral vibration of the body: front and rear. If the defective tire is installed at the rear, side jolts will be felt intermittently in the driver's seat
- Lateral vibrations appear more clearly if the faulty tire is on one of the front wheels. In this case, the longitudinal vibrations of the sheet body panels become noticeable and it seems to the driver that the vertical axis of the vehicle's vibrations passes through his place
- In transverse vibrations of low intensity, when it is not possible to establish the location of the faulty wheel, it is necessary to do the following: test the car with a run to determine the location of the faulty wheel: front or rear; replace the wheels of the car with similar, but known to be in good condition (for example, dismantled from the same car), it is recommended to start by replacing the rear wheels and testing the car on the go. If there are no signs of malfunction and the behavior of the car has improved, you should return to the car first one of the removed wheels, and then the other. This will identify the faulty wheel. If lateral vibrations continue after replacing the rear wheels, it is necessary to replace the front wheels with known good ones. After that, it is necessary to return to the car one of the dismantled wheels and thus determine the faulty
Pulling the car to the side
- When driving, the vehicle tends to shift laterally when driving on a flat, level road (without cross slope) and with a free steering wheel
- Vehicle drift is usually caused by the following reasons: tire design features; uneven braking forces on the sides of the car; wheel misalignment
- Violation of manufacturing technology or some design features of tires can cause the car to be driven away. For example, the displacement of a steel belt from the equatorial plane of a radial tire leads, even with a straight wheel movement, to the occurrence of a lateral force that causes a rolling with a slip. The tire tends to move like a cone
- To find out the reason for the withdrawal of the car, it is necessary to carry out diagnostics in accordance with the recommended algorithm