Fig. 12.7. Repair of the front brake caliper: A - using compressed air to push the piston out of the caliper cylinder; B - removing the piston seal ring from the caliper cylinder
- Remove the front brake caliper.
- Clean the caliper from dust and dirt, do not inhale the raised dust.
- Secure the caliper in a vice with soft metal plates installed on the jaws.
- Remove the GIRLING retaining ring and dust cover from the piston.
- Remove the piston from the caliper by supplying low-pressure air to the brake cylinder through the hole for connecting the brake hose, installing a wooden block instead of brake pads, since the presence of traces of damage on the piston skirt makes it unsuitable for further use.
- Remove the wooden block and carefully remove the piston. Carefully, so as not to damage the cylinder walls, remove the rectangular section seal from the groove of the caliper cylinder.
- Wash all parts in methylated spirits or clean brake fluid and wipe them dry. Blow out tubes and holes with compressed air.
- Check the condition of all caliper parts and replace worn or damaged parts. Pay special attention to the cylinder and piston. If there are scratches, marks, wear or pitting, the piston and cylinder must be replaced. Regardless of the condition, replace all rubber seals.
- Before assembling the caliper, lubricate the piston seal, piston and cylinder with brake fluid.
- Assembly is carried out in the reverse order of disassembly.
- After installing the caliper, bleed the air from the brake system circuit where the brake hose was disconnected from the caliper.