Pontiac Fiero 1988 Service Manual page 259

5B10-8 DISC BRAKE CALIPER ASSEMBLY 48H REAR CALIPER
7. Lower car. See Section OA.
8.
Operate parking brake several times to check adjust-
ments. After cable adjustment, the parking brake
lever should not travel more than six ratchet clicks.
Rear wheels should not rotate forward when lever is
applied three to six ratchet clicks.
UNIT REPAIR
CALIPE R OVERHAUL
Remove or Disconnect
• Caliper from vehicle as previously described.
•
1.
Disassemble (Figures 14 through 16)
Nut (9), lever (10) and lever seal (12).
Inspect
• Bracket (25) and bridge (26) for cracks or distor-
tion.
Bridge bolts (24) bracket (25) and bridge (26), only if
bridge or bracket is suspected of being cracked or
damaged.
• Caliper housing (27) can be overhauled without
removing bridge (26).
Piston assembly (14).
• Use clean shop towels as a pad over bridge (26)
and under caliper housing (27) during piston
removal.
• Use a wrench to turn actuator screw (18) in
parking brake "apply" direction, to work piston
assembly (14) out of caliper housing (27).
I?
Inspect
• Piston assembly (14) for scoring, nicks, corro-
sion and worn or damaged chrome plating.
• Replace piston assembly (14) if any of the
above are found.
Actuator screw (18) by pressing on thread end.
Inspect
• Actuator screw (18) for cracks and thread dam-
age.
5. Balance spring (19).
6. Shaft seal (21) and thrust washer (20) from actuator
screw (18).
7. Boot (16).
• Be careful not to scratch housing.
NOTICE: Do not use a metal tool to remove piston
seal. Metal tools may damage caliper bore or seal
groove.
8. Piston seal (17) from groove (39) in caliper housing
(27).
• Use a wooden or plastic tool.
Inspect
• Caliper bore and seal groove (39) for scoring,
nicks, corrosion and wear.
• Use crocus cloth to polish out light corro-
sion.
• Replace caliper housing (27) if corrosion
in and around seal groove (39) will not
clean up with crocus cloth.
Bleeder valve cap (22) and bleeder valve (23) from
caliper housing (27).
Clean (Figure 14)
• All parts in clean, denatured alcohol.
8. ACTUATOR SCREW
27. CALIPER H O U S I N G
J 1 0 0 1 5 - 5 B 1 0 - P
16. B O O T
27. CALIPER H O U S I N G
J 1 0 0 1 6 - 5 B 1 0 - P
Figure 1 5 Removing Caliper Piston
Figure 16 Removing Caliper Boot