TM 9-2330-373-14 & P
Section VI. BRAKE SYSTEM MAINTENANCE PROCEDURES
The following paragraphs cover procedures for removal, disassembly, assembly and installation of brake shoe assembly,
wheel cylinder assembly, master cylinder assembly, brake air chamber assembly, relay valve, hydraulic lines and air lines.
These paragraphs also cover brake adjustment, bleeding the hydraulic brake system, cleaning, inspection and repair of
hydraulic lines and air lines.
The service brakes are air-over-hydraulic type with automatic break-away protection. When the semitrailer brake system is
properly connected to the service brake system of the towing vehicle, the towing vehicle brake pedal operates the brakes
on both vehicles.
THIS TASK COVERS
No brakes or weak brakes
Brake drum running hot
Test Equipment Required:
Wear goggles when opening air reservoir drain cock. Failure to do so could cause serious eye injury from
high pressure air.
Release pressure from braking system by opening drain cock on air reservoir.
Place Jack under axle and raise rear of semitrailer until tires clear ground.