OVERHAUL

Fig. 1: To remove the rear wheel cylinder, remove the brake shoes and unbolt the brake line attached to the back of the wheel cylinder, . . .

Fig. 2: . . . remove the two attaching bolts . . .

Fig. 3: . . . and lift the wheel cylinder off the brake backing plate

Fig. 4: Exploded view of the rear wheel cylinder used through 1978

Fig. 5: Exploded view of the rear wheel cylinder used from 1979 through 1986

Remove the wheel cylinder.
Remove the piston and adjusting screw, then remove the boot and adjuster.
Using compressed air in the inlet port, blow out the piston cup, expander and spring.
Clean all parts in clean brake fluid.
Inspect all parts for wear or damage. Replace any worn, discolored, misshapen or suspect part. The cylinder bore may be honed to remove light scoring, pitting or discoloration. If honing cannot polish the interior, discard the cylinder. Check the piston-to-bore clearance. If the clearance exceeds 0.15mm (0.0059 in.), replace the cylinder.
Assembly is the reverse of disassembly. Coat all parts in clean brake fluid before assembly.
Install the wheel cylinder and all other parts. Bleed the system.