Pic. 15-30. Rear caliper: 1 - self-locking bolts, 35 Nm; 2 – a support with the lever for a cable of a parking brake; 3 - bleed valve; 4 - protective cap; 5 - sealing ring; 6 - piston; 7 guide pin; 8, 9 - protective covers; 10 - caliper holder
Details of a back support are presented on fig. 15-30.
Clean the caliper from dust and dirt, while using respiratory protection.
Pic. 15–31. Using tool 3272 to unscrew the piston from the caliper
Unscrew the piston from the caliper using tool 3272 (pic. 15–31). To unscrew the piston, position the tool so that the shoulder of the tool fits into the grooves of the piston. Rotate the tool body counterclockwise until it stops. Rotate the tool handle counterclockwise to unscrew the piston from the caliper.
Carefully pry the seal out of the caliper cylinder groove using a wedge or a flathead screwdriver blade as a lever.
Check the condition of all caliper parts, replace worn or damaged parts. Pay special attention to the cylinder and piston. Replace piston and cylinder if scratched, scored, worn, or pitted. Replace rubber seals regardless of condition.
Wash all parts in methanol or clean brake fluid and wipe dry. Blow out the pipes and holes with compressed air.
Pic. 15–21. Installation location of the protective cover on the caliper piston
Apply a thin layer of grease G 052 150 A2 to the O-ring and piston (see fig. 15–21).
Install the dust cover on the piston so that the inner diameter of the cover fits into the piston groove.
Pic. 15–32. Using a special tool to install the working edge of the dust cover in the caliper
Install the piston against the caliper cylinder and, using a special tool, insert the working edge of the dust cover into the caliper until it locks into place (pic. 15–32).
Screw the piston into the caliper using tool 3272. To screw in the piston, install the tool so that its shoulder fits into the grooves of the piston. Rotate the tool body counterclockwise until it stops. Turning the tool handle clockwise, screw the piston into the caliper (see fig. 15–31).
After installing the piston, it is necessary to blow out the cylinder with air and fill it with fresh brake fluid.
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