Wheel cylinder bores and pistons that are badly scored or pitted should be replaced. Cylinder walls that have light scratches, or show signs of corrosion, can usually be cleaned with crocus cloth, using a circular motion. Black stains on the cylinder walls are caused by piston cups and will not impair operation of cylinder.

ASSEMBLING WHEEL CYLINDERS

Before assembling the pistons and new cups in the wheel cylinders, dip them in clean brake fluid. If the boots are deteriorated, cracked or do not fit tightly on the pistons or the cylinder casting, install new boots.

(1)Coat cylinder bore with clean brake fluid.

(2)Install expansion spring with cup expanders in cylinder. Install cups in each end of cylinder with open end of cups facing each other (Fig. 3).

(3)Install piston in each end of cylinder having the flat face of each piston contacting the flat face of each cup, already installed (Fig. 3).

(4)Install a boot over each end of cylinder. Be careful not to damage boot during installation.

INSTALLING WHEEL CYLINDERS

(1)Apply Mopart Gasket In-A-Tube or equivalent sealant around wheel cylinder mounting surface (Fig. 4).

(2)Install wheel cylinder onto brake support, and

tighten the wheel cylinder to brake support plate attaching bolts to 8 NIm (75 in. lbs.).

Fig. 4 Apply Sealant on Support Plate

(3)Attach hydraulic brake tube to wheel cylinder, and tighten tube to wheel cylinder fitting to 17 NIm (145 in. lbs.).

(4)Install brake shoes on support plate.

(5)Install rear brake drum onto rear hub. Install

rear wheel and tire assembly, tighten wheel stud nuts to 129 NIm (95 ft. lbs.).

(6)Adjust the rear brakes, (See Adjusting Service Brakes) in Service Adjustments section in this group of the service manual.

(7)Bleed the entire brake system. See (Bleeding Brake System) in Service Adjustments section in this group of the service manual.