Caution: Disc brake pads should be replaced on both front wheels at the same time - never replace them on just one wheel. Also, remember that dust generated by the brake system may contain asbestos, which is hazardous to health. Never blow out such dust with compressed air or inhale it. When servicing the brake system, it is necessary to wear a protective filter mask! Under no circumstances should petroleum-based solvents be used to clean brake parts (kerosene, gasoline). Use only brake cleaner or denatured alcohol.
Note: When servicing disc brakes, use only high quality branded brake pads.
1. Unscrew the cap from the brake fluid reservoir and use a bulb to pump out about 60 g of fluid.
2. Loosen the wheel nuts, raise the vehicle and secure it on struts.
3. Remove the front wheel, then reinstall the three nuts (flat side to the disk), to hold the disc in place. Perform work on one brake mechanism only, using the assembled brake for comparison if necessary.
4. Carefully inspect the disc as described in Section 4. If grinding is necessary, follow the information in that section regarding disc removal; at this time, you can also remove the pads from the caliper.
5. Push the piston back into the cylinder. If necessary, a C-clamp can be used, but usually a flat block is sufficient (with a crowbar) (see illustration). When the piston is pressed into the cylinder, the fluid level in the master cylinder will rise. Be careful not to spill any liquid. If necessary, remove some more liquid as described in point 1.
2.5. To press the piston into the caliper during removal, you can use a C-shaped clamp
6. Replace the pads (see illustrations 2.6a-2.6l).
7. When installing the caliper in its original place, do not forget to tighten the bolts to the torque specified in the technical specifications of this chapter. When finished, press the brake pedal hard several times to ensure that the brake pads come into contact with the disc.
2.6a. To unscrew the two caliper mounting bolts, you need to use a Torx 50 head (the bolts are indicated by arrows) on 1990 and 1991 vehicles, do not attempt to remove these bolts with a hex wrench as this may damage the bolt heads |
2.6b. Caliper bolts (indicated by arrows) on cars produced in 1992 and later - a regular hexagonal type |
2.6v. Remove the inner shoe |
2.6g. Unhook the outer pad from the caliper |
2.6d. Now use the C-clamp to push the piston all the way into the cylinder |
2.6e. Check for damage and corrosion on the caliper bolts and bushings (A) and contact surfaces (B) |
2.6g. Carefully press back the edge of the piston protective cover and check for any signs of corrosion or brake fluid leaks |
2.6z. Snap the inner shoe retaining spring into the new shoe in the direction shown (arrow). If the new shoe already has a retaining spring installed, skip this operation |
2.bi. Lightly lubricate the contact surface of the lower steering knuckle with lithium-based grease |
2.6k Apply a thin coat of white lithium based grease to the mating surface between the upper steering knuckle and the caliper |
2.6L Position the pads and snap the inner pad into place in the piston
(The material was created based on information from the website «chevyman.ru»)