The hydraulic brake, commonly referred to as the plain H, is a light duty, two-shoe-type brake, mounted on a
backing plate which also serves as a dust shield (refer to Fig. 1). Adjustable anchor pins provide a means of
centering the brakeshoe arc in relation to the drum, and secondary or minor adjustments are made by rotating
the eccentric cam which bears on the brakeshoe web or pin in the shoe web.
HYDRAULIC BRAKE LAYOUT
DISASSEMBLY (Refer to Fig. 2 and 3)
Disconnect brakeshoe return spring.
Remove anchor pin C-washers and guide pin locks and washers.
Remove brakeshoe and lining assemblies.
Remove anchor pin locknuts, lockwashers, and anchor pins.
For complete disassembly remove capscrews, washers, and wheel cylinder assembly and
disconnect hydraulic lines.
REASSEMBLY (Refer to Fig. 2 and 3)
Position wheel cylinder, install capscrews, and lockwashers and tighten securely.
Insert anchor pins and install washers and locknuts. (Punch marks must be together and wrench
flats in line.)
Position shoe and lining assemblies and install washers and lockrings.
Back off adjusting cams and position shoes on push rods in wheel cylinder.
Hook shoe return spring in brake- shoe web holes.
Following overhaul or when new linings are installed, the initial adjustment should be carefully made to both
properly locate the curvature of the lining to the drum and obtain the proper clearance.
Each shoe must be adjusted to center the brakeshoe arc in relation to the drum. Adjust cam to bring lining into
contact with the drum and rotate anchor pin sufficiently to relieve drag. Repeat until additional rotation of
anchor pin will no longer relieve drag. Lock anchor pin locknut and back off cam sufficiently to permit wheel to
turn freely (refer to Fig. 4 and 5).
Subsequent adjustments to compensate for lining wear are made with the eccentric cam only (refer to Fig. 4
and 5). Turn cam to bring lining into contact with the drum. Back off sufficiently to permit free rolling drum.
Repeat on opposite shoe.