Removal
To remove the rear disc brake pads, perform the following operations in sequence.
Fig. 14.38. Rear disc brake caliper: 1 – return spring; 2 – parking brake lever; 3 – lever dust cover; 4 – rod lever; 5 – lower guide pin (26 Nm); 6 – lower guide pin bushing; 7 – caliper body; 8 – lower guide pin boot; 9 – adjusting rod; 10 – limiter; 11 – limiter plate; 12 – return spring; 13 – spring housing; 14 – retaining ring; 15 – piston dust cover ring; 16 – piston dust cover; 17 – piston assembly; 18 – piston sealing ring; 19 – O-ring gasket; 20 – connecting rod; 21 – Upper guide pin boot; 22 – bleed nipple (7.8 Nm); 23 – caliper bracket (assembled with brake pads, pad guides and gasket); 24 – outer gasket; 25 – shoe guide; 26 – brake shoe assembly; 27 – brake shoe with wear indicator assembly; 28 – Upper guide pin (26 Nm); 29 – Upper guide pin bushing; 30 – caliper bracket
1. Unscrew the lower guide pin 5 (see Fig. 14.38).
2. Lift up the bracket 23 of the caliper (assembled with the brake pads, pad guides and gasket).
3. Remove the outer gasket 24.
4. Remove the brake shoe 26 as an assembly.
5. Remove the brake shoe 27 with the wear indicator assembly.
Examination
Measure the thickness at the thinnest part of the brake shoe lining. Replace the brake shoe assembly if the lining thickness is less than the maximum permissible value of 2.0 mm.
Caution! If the brake pad lining thickness decreases to the maximum permissible value, replace all brake pads on all wheels at the same time.
Caution: If a significant difference in the thickness of the left and right brake shoe linings is noticed, check the movement of the piston, as well as the lower and upper guide pins.
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Installation
Installation is carried out in the reverse order of removal, taking into account the following.
1. Before installing the pads, use a special tool to press the piston into the caliper.
2. After installing the pads, you need to press the brake pedal several times to set the pads in the working position.