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TM 9-2330-398-24
Section VII. BRAKE SYSTEM MAINTENANCE
Paragraph
Page
Number
Paragraph Title
Number
2-47
General............................................................................................................................
2-120
2-48
Brake-Actuating Camshaft Replacement ........................................................................
2-121
2-49
Brakeshoe Replacement .................................................................................................
2-124
2-50
Slack Adjuster Replacement ...........................................................................................
2-128
2-51
Brake Air Chamber Replacement and Test ....................................................................
2-131
2-52
Service and Emergency Couplings, Air Lines, and Fittings Replacement ......................
2-133
2-53
Emergency Relay Valve Replacement............................................................................
2-135
2-54
Air Reservoir Replacement .............................................................................................
2-136
2-55
Safety Relief Valve Replacement....................................................................................
2-138
2-56
Parking Brake Control Valve Replacement .....................................................................
2-140
2-57
Air Line Tubing and Fittings Replacement ......................................................................
2-142
2-58
Brake Air Hose Replacement ..........................................................................................
2-144
2-59
Full Function Valve and Direct Linear Valve Replacement .............................................
2-146
2-60
Release of Fail-Safe Chamber Brakes............................................................................
2-148
2-47. GENERAL.
The M969A2 semitrailer brakes are air-operated, cam-type brakes. Two brake-actuating camshafts, slack adjusters,
and brake airchambers are assembled on each axle. When the brake is actuated air is applied to the brake chambers
and the diaphragm rod moves the slack adjusters, rotating the brake camshaft against the two rollers on the
brakeshoes. This action forces the brakeshoes against the brakedrum, causing friction to slow or stop the vehicle.
2-120
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