With the vehicle on wheels, loosen the wheel bolts.
Raise the corresponding part of the car and fix it on stands, unscrew the bolts and remove the wheel.
Measure the brake disc thickness with a micrometer. You can also measure the thickness of the brake disc with a caliper. Due to the fact that there is a step around the perimeter of the brake disc, therefore, when measuring the thickness of the brake disc using a caliper, place two coins under the jaws of the caliper (see fig. 11.13). To determine the true thickness of the brake disc, subtract the thickness of two coins from the caliper readings.
Attention. The thickness of the brake disc must be measured at several points along the circumference of the brake disc. The true thickness of the brake disc must be taken as the smallest of the measured values (see fig. 11.14).
Brake disc dimensions are given in «Technical data» given at the beginning of this chapter.
If the thickness of the brake disc is less than the limit, the disc must be replaced.
If there are scratches or cracks deeper than 0.5 mm, the brake disc must be replaced.
Apply a thin layer of lubricant to the shoulder that centered the wheel disc. Install the wheel, aligning the previously applied marks, and secure it with bolts. Lower the vehicle to the ground and tighten the wheel bolts to 120 Nm.
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