Loosen the wheel nuts of the vehicle while it is parked on the ground.
Raise the vehicle and remove the wheel, having first marked the position of the disc relative to the hub.
Measure the thickness of the brake disc. At service stations, special gauges are used for this purpose, since wear causes an edge to form on the disc. The thickness of the brake disc can also be measured using a caliper. However, in this case, it is necessary to place spacers of a known thickness on each side of the disk (for example, 2 coins). To obtain an accurate result, the total thickness of the gaskets should be subtracted from the measured value.
Attention: Measure at least 8 points along the disc diameter.
When the wear limit is reached, the brake disc should be replaced.
If there are significant cracks or grooves more than 0.5 mm deep, the brake disc must be replaced.
If a dial indicator is available, measure the lateral runout of the disc in the installed position. Place the appliance as close to the outer edge as possible.
Lateral runout should not exceed 0.15 mm. A large runout may be caused by a worn out front wheel hub bearing.
Install the wheels, observing the marks made during removal. Lower the vehicle and tighten the wheel nuts in a cross pattern.