Pontiac Fiero 1988 Service Manual page 253

5B10-2 DISC BRAKE CALIPER ASSEMBLY 48H REAR CALIPER
This caliper has a single bore and is mounted to the
support bracket with two mounting bolts. Hydraulic pres-
sure, created by applying force to the brake pedal, is con-
verted by the caliper to a stopping force. This force acts
equally against the piston and the bottom of the caliper bore
to move the piston outward and to slide the caliper inward
which results in a clamping action on the rotor. This clamp-
ing action forces the linings against the rotor, creating fric-
tion to stop the vehicle.
When the parking brake is applied, the lever turns the
actuator screw, into a nut in the piston assembly which
causes the piston to move outward and the caliper to slide
inward, mechanically forcing the linings against the rotor.
The piston assembly contains a self-adjusting mechanism
to keep the parking brake in proper adjustment.
NOTICE: Do not use lubricated shop air on brake
parts as damage to rubber components may result.
Important
Replace all components included in repair kits used
to service this caliper.
Lubricate rubber parts with clean brake fluid to make
assembly easier.
If any hydraulic component is removed or discon-
nected, it may be necessary to bleed all or part of the
brake system.
Replace shoe and linings in axle sets only.
The torque values specified are for dry, unlubricated
fasteners.
Perform service operations on a clean bench, free
from all mineral oil materials.
ON-CAR S E R V I C E
S H O E AND LINING A S S E M B L I E S
Remove or Disconnect (Figures 1 through 9)
Tools Required:
J 6125-1B Slide Hammer
J 36620 Spring Pin Remover
J 36621 Piston Rotator Wrench
Two-thirds of brake fluid from master cylinder assem-
bly.
Release parking brake and raise car.
Mark relationship of wheel to axle flange.
Wheel and tire. See Section 3E.
• Install two inverted wheel nuts to retain rotor.
7. Two-way check valve (15) from end of piston assem-
bly (14) using small screwdriver.
1.
2.
CAUTION: Be prepared to catch springs when
removing spring pins. Springs may fly out caus-
ing injury to personnel.
3. Spring pins(1).
• Connect J 36620 onto J 6125-1B.
• Remove threaded tip from rod on J 36620.
Insert rod completely through pin (1) and install
threaded tip as far as it will go.
• Thrust weight on J 6125-1B outward, against
tool handle to drive out pin (1).
4. Springs (5) from inboard and outboard shoe flanges.
5. Outboard shoe and lining (2).
• Lift through caliper opening. Loosen parking
brake cable adjustment, if necessary.
6. Inboard shoe and lining (3).
• Lift through caliper opening.
• If necessary, push on bridge (26), moving cali-
per inboard to provide clearance for removing
inboard shoe and lining (3).
1.
2.
3.
4.
5.
26.
27.
SPRING PIN
O U T B O A R D SHOE & L I N I N G
I N B O A R D SHOE & L I N I N G
WEAR SENSOR
SPRING
BRIDGE
CALIPER H O U S I N G
J 1 0 0 0 2 - 5 B 1 0 - P
Figure 2 Shoe and Lining Assembly