Section VII. BRAKE SYSTEM MAINTENANCE

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TM-9-2330-380-14-P Semitrailer Van: Electronic Tactical 12-Ton 4-Wheel XM1063 (NSN 2330-01-224-9244) and M129A4 (NSN 2330-01-372-5642) Manual

Front Relay Valve

TM 9-2330-380-14&P

Section VII. BRAKE SYSTEM MAINTENANCE

Paragraph

Page

Number

ParagraphTitle

Number

4-42

General ..........................................................................................................................

4-67

FrontRelayValve ...........................................................................................................

4-68

RearRelayValve ............................................................................................................

4-70

RatioRelayValve ...........................................................................................................

4-72

Brake Air Chamber ........................................................................................................

4-74

AirReservoir ..................................................................................................................

4-77

Gladhand(AirHalf-Coupling) ..........................................................................................

4-81

Hose,TubingandFittings .................................................................................................

4-83

4-42. General

WARNING

Air under 100 psi pressure is used in the operation of the air brake system. Serious injury or death

can result if precautions are not taken.

a. The following paragraphs cover procedures for testing, removal, disassembly, assembly and installation

of brake shoe assembly, brake air chamber assembly, relay valve, ratio relay valve, air reservoir and air

lines. These paragraphs also cover cleaning, inspection and repair of air lines.

b. The service brakes are straight air 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.