Chrysler RAM TRUCK 2500 1994 Service Manual page 206

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DISC BRAKES 5 - 47
CALIPER
PISTON
PISTON
BORE
OUTBOARD
SHOE
INBOARD
SHOE
SEAL
J9405-102
Fig. 5 Disc Brake Caliper Operation
When the brakes and fluid pressure are released, the
seal relaxes and retracts the piston.
The amount of piston retraction is determined by
brakelining wear. Generally, the amount is just
enough to maintain contact between the piston and
inboard brakeshoe. I n addition, running clearance at
the rotor will be held between zero and a maximum
of 0.12 mm (0.005 in.).
PISTON,
PISTON SEAL
BRAKE
PRESSURE
O N
CYLINDER BORE
CALIPER
HOUSING
> DUST BOOT
PR747B
Fig. 6 Lining Wear Compensation By Piston Seal
DISC BRAKESHOE REMOVAL
(1) Raise vehicle.
(2) Remove wheel and tire assemblies.
(3) Press caliper piston back into bore with large
flat blade screwdriver (Fig. 7). Use large C-clamp to
bottom piston in bore i f additional force is required.
(4) Remove caliper mounting bolts with 3/8 hex
wrench or socket (Figs. 8 and 9).
(5) Rotate caliper rearward off rotor and out of
steering knuckle support ledges (Fig. 10).
(6) Remove inboard and outboard brakeshoes (Figs.
11 and 12). Inboard shoe has spring clip that holds i t
INBOARD
BRAKESHOE
CALIPER
PISTON
PRY
TOOL
J9405-47
Fig. 7 Pressing Caliper Piston Back Into Bore
J9405-27
Fig. 8 Caliper Mounting Bolt Removal/Installation
(1/2 Ton)
J9405-48
Fig. 9 Caliper Mounting Bolt Removal/Installation
(3/4 and 1 Ton)
in caliper piston. Tilt this shoe out at top to unseat