Examination
1. Loosen the wheel nuts, raise the vehicle and securely support it on struts. Remove the wheel and tighten the three wheel nuts (flat side to the disk), to hold the disk in place.
2. Remove the brake caliper as described in section 3. There is no need to disconnect the brake hose. After unscrewing the caliper bolts, hang the caliper on a wire (see illustration).
4.2. Hang the support on the wire whenever it is necessary to change its position (do not leave it hanging on the brake hose!)
3. Inspect the surface of the disc: check for scratches, grooves and other damage. The presence of small scratches and fine grooves may be considered normal and will not always significantly affect the performance of the brakes, however, deep grooves (more than 0.015 inches (0.38 mm) deep) require the removal of the disc and its regrinding in a workshop. Don't forget to check both sides of the disc (see illustration). If you notice pulsations when pressing the brakes, this may indicate disc beating.
4.3 The brake pads on this car are completely worn out; the disc has deep grooves - the wear is so great that the disc will need to be replaced
4. To check for disc runout, place the indicator at a point approximately 1/2 inch from the outer edge of the disc (see illustration). Set the indicator to zero and turn the dial. The indicator readings must not exceed the maximum allowable runout limit specified in the specifications. If this limit is exceeded, the disc must be reground in a workshop.
4.4 a. Use the indicator to check for wear by placing the indicator needle approximately 1/2 inch away from the outer edge
Note: It is recommended to re-grind regardless of the indicator readings, as this will provide a smooth surface and ensure the absence of brake pedal pulsation and other disc-related problems. If you decide not to re-sand the wheels, at least remove the polish ("glaze") from the surface using medium-grit sandpaper, using circular motions (see illustration).
4.46. If you decide not to regrind the wheels, at least remove the polish ("glaze") from the surfaces using sandpaper
5. It is absolutely unacceptable to grind the disc when its thickness is below the permissible limit. The minimum thickness at which the disc must be replaced is cast on the inside of the disc (see illustration). It should not be confused with the minimum thickness at which regrinding of the disc is permissible. The thickness of the disc can be checked using a micrometer (see illustration).
4.5a. Thickness at which the disc must be replaced (indicated by the arrow), cast on the inside of the disc |
4.5b. Measure the thickness of the disc with a micrometer |
Removal
6. Remove the wheel nuts that were tightened to hold the disc in place and remove the disc from the hub.
Installation
7. Place the disc over the studs.
8. Install the caliper and brake pads onto the disc and place them on the steering knuckle (see section 3, which contains a description of the caliper installation procedure). Tighten the caliper bolts to the torque specified in the specifications in this chapter.
9. Install the wheel, then lower the car to the ground. Press the brake pedal several times to ensure that the brake pads come into contact with the disc. If the brake fluid hose was not disconnected from the caliper, then there is no need to bleed the system. Before using the vehicle in normal conditions, carefully check the operation of the brakes.
(The material was created based on information from the website ChevyMan.ru)