User's Manual

11
FIGURE 22 - PISTON ADJUSTER
FIGURE 23 - NEW AND OLD STYLE PISTON AND
OVERRIDE WHEEL
the pressure side. Liberally grease the ramp face and
insert the assembly into the bore of the housing until it
engages the wedge cage and rollers, Figure 16. Install
and tighten the stop pin to 16 ft. lbs. (23,3 N.m).
7. Fit the dust boot to the input tappet/piston, lubricate the
piston seal with new DOT 4 brake fl uid and install the
seal onto the piston with the lip facing inward, Figure
20. Grease the inside of the dust boot with the grease
supplied and install the input tappet/piston assembly
into the housing bore until it rests on the roller tappet/
piston. Fit the dust boot to the end of the housing.
8. Turn the expander housing in the vise to enable the
wedge return spring to be installed. Locate the spring
ferrule on the spring and compress the spring over the
wedge stem until the pin can be inserted, Figure 16.
Release the spring carefully.
Note: Push in wedge assembly slightly and center it inside
the housing.
9. Install the bleed screw.
10. Install the expander to the backing plate (dirtshield)
using a new gasket, Figure 1, and secure in place with
fi xing bolts.
11. Refer to the vehicle service manual and stall the
parking brake chamber. Install bridge pipe and hydraulic
hose.
12. Install the brake shoes following procedures under
Brake Shoe Installation in this manual. Refer to the
vehicle service manual for procedures to bleed the air
from the brake system. After bleeding, manually readjust
the brake shoe to drum clearance as necessary. Refer
to Brake Shoe Adjustment in this manual.
ASSEMBLE WHEEL CYLINDER UNIT
Use all of the parts supplied in the Bendix repair kit to
replace the old parts removed from the cylinder.
1. Lubricate the piston seal, Figure 15, with new DOT 4
brake fl uid and install the seal onto the piston with the
lip facing inwards, Figure 21.
Install the dust boot to the piston and smear the inside
of the dust boot with the grease furnished in the kit.
OVERRIDE
WHEEL
RETAINER RING
RETAINER
RING
GROOVE
IN PISTON
OLD STYLE
GROOVE IN PISTON
HAS BEEN ELIMINATED
OVERRIDE WHEEL
NEW STYLE
FIGURE 21 - WHEEL CYLINDER
PISTON
SEAL
DUST BOOT
SCREW ON FULLY AND UNSCREW ONE
COMPLETE TURN