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21. Use a suitable tool to remove the 76.2 mm (3
in.) diameter service piston O-ring (1, Figure 6-
15) and backup ring (2) from each piston bore
groove of the caliper housing. Discard the O-
rings and backup rings.
FIGURE 6-15. PISTON O-RINGS
1. O-Ring
22. Remove all fittings, plugs and bleeder screws
from each caliper housing. Mark the position
and location of the fittings for correct reinstalla-
tion. Note the location of the bleeder screws
and plugs for correct installation.
23. Thoroughly clean the exterior and interior of the
brake caliper housing with approved solvent.
NOTE: Verify that all O-ring grooves are clean and
free of foreign material. Use compressed air to blow
out the entire brake caliper housing. Be sure to blow
out internal passageways.
24. Repeat this procedure for each caliper half.
J06025 10/06
2. Backup Ring
Armature Speed Rear Disc Brakes
PISTON SUBASSEMBLY
Disassembly
NOTE: Disassembly of the piston subassembly
during brake overhaul is not mandatory. Clean the
piston subassembly thoroughly. If the piston surface
is acceptable for reuse and the piston subassembly
passes the functional tests for adjusting grip force,
spring force and built-in clearance (BIC), return the
piston subassembly to service.
1. Remove the O-ring and adjuster pin washer.
2. Remove the lock ring.
Observe all warnings and cautions provided by
the press manufacturer to avoid damage to com-
ponents and serious personal injury.
3. Place the piston subassembly on an arbor
press table (5, Figure 6-16). Use special sleeve
(2), over the adjuster pin. Lower the arbor and
compress the return spring to minimum height,
and hold.
FIGURE 6-16. PISTON SUBASSEMBLY
1. Arbor
2. Special Sleeve A
3. Threaded Ring
4. Return Spring
5. Arbor Press Table
6. 1.40 - 1.65 mm (BIC)
(0.055-0.065 in.)
J6-11
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