Basic Checks
Check and, if necessary, correct the tire pressure.
Carry out a test drive, reducing the manifestation of vibrations as much as possible (appropriate speed range, best roads, smooth straight-line and cornering).
Raise the car.
Check wheel alignment. In this case, the hub or brake drum must protrude beyond the edge of the rim or at least be flush with it. Otherwise, replace the rim.
Check wheel suspension. At the same time, also check the condition of silent blocks, hinges, shock absorbers and discs.
Remove and clean wheels. Remove small stones that have fallen into the profile.
Check the tires for wear caused by heavy braking with locked wheels.
Check the profile depth of each wheel and compare the obtained values. In case of abnormal tire wear at the front and / or rear, measure the geometry of all wheels and, if necessary, adjust the toe-in (upper tolerance limit).
Attention! To carry out measurements, a special measuring device is required, which is available at the service station.
Carry out a test drive and check for any defects, if necessary, repeat the adjustment.
Checking the axial and radial runout of the wheels
With the vehicle raised, place the dial gauge first on the work surface and then on the side of the tire. Slowly rotate the wheel by hand, following the indicator readings, mark the place of the maximum measured value with chalk on the tire.
Valid values:
- maximum radial runout - 0.8 mm,
- maximum axial runout - 1.2 mm.
If these values are exceeded, balance the wheel on a stationary balancing machine. In this case, the wheel must be centered in the same way as on the car. The use of a conical clamping device that centers the wheel in the center hole is not permitted. The allowable residual unbalance for both balancing planes is 5 g.
Elimination of radial runout of wheels
Release the air from the tire and disassemble the wheel.
Rotate the tire on the rim by 120°.
Inflate the tire and check the radial runout again.
If the maximum runout value has increased, turn the tire around the rim another 120°and measure the runout again.
If the maximum runout value is maintained, balance the wheel.
Checking the axial and radial runout of the discs
Install the rim without tire on the wheel balancer or on the car. Attach a dial indicator.
Check the axial and radial runout of the disc. Radial runout (out-of-roundness) measured on the shoulder of the disc, and axial - on the lateral surface of the protrusion of the disc. At the same time, do not take into account the point "emissions" indications due to elevations or depressions in the material.
Permissible values for steel rim:
- maximum axial runout - 1.0 mm,
- maximum radial runout - 0.8 mm.
Permissible values for light alloy wheel:
- maximum axial runout - 0.3 mm,
- maximum radial runout - 0.25 mm.
If the specified limits are exceeded, replace the drive.
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