1. Raise the vehicle.
2. Measure the axial runout with a dial indicator (photo), placing it on a massive support so that the indicator leg touches the disk. In the absence of an indicator, runout can be checked using a wooden pin with a smooth end mounted on a massive support.
3. Rotating the wheel, check the runout on the indicator. If a pin is used for measurements, then find the point of contact of the disk and the place with the greatest deviation of the disk from the pin and measure the gap at the place of the greatest deviation. Permissible runout 2.0 mm.
4. Check the radial runout on the indicator. If a pin is used for measurements, then find the point of contact of the disk in the radial direction and the place with the greatest deviation of the disk from the pin in this direction. Measure the clearance at the point of greatest deviation. Permissible radial runout 1.5 mm.
5. If the measured values exceed the norm, then replace or straighten the disc.