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|  MIL-T-2452J
3.4.11 Brakes. The brakes shall conform to Federal Motor Carrier Safety Regulations
393.40 through 393.43 and 393.45 through 393.52. When available as the manufacturer's
standard or as an option, brake linings shall be of nonasbestos material.
3.4.11.1 Power hydraulic or air type. Class A vehicles shall be equipped with either
power assisted, hydraulically actuated, four-wheel service brakes or full-air brakes.
3.4.11.1.1 Split hydraulic brake system. When power hydraulic brakes are furnished, the
brake system shall be so arranged as to provide separate systems for at least two wheels and so
designed and constructed that rupture or leakage type failure of any single pressure component of
the service brake system, except structural failures of the brake master cylinder body,
effectiveness indicator body, or other housing common to the divided system, will not result in
complete loss of function of the vehicle brakes when force on the brake pedal is continued.
"Pressure component" means any internal component of the brake master cylinder or master
control unit, wheel brake cylinder, brake line, brake hose, or equivalent, except power assist
components.
3.4.11.1.2 Indicator light. The split hydraulic brake system shall be equipped with an
electrically operated red light mounted on the instrument panel to indicate system effectiveness.
The light shall have an area of not less than 0.196 square inch. It shall illuminate before or upon
application of the brakes when an actuating-pressure component of the system has sustained a
loss of pressure. The indicator light system shall include a means for testing by the vehicle
operator to assure that the light bulb is operable.
*
3.4.11.2 Air brakes. Class B, C, D and E vehicles shall be equipped with full-air brakes
on all wheels. The braking system, complete with all necessary components, shall include:
(a)
Air compressor, unloader-head type, engine driven and engine lubricated, air- or
water-cooled, and having a capacity of not less than 7-1/4 cubic feet per minute
(cfm) for classes A and B and not less than 12 cfm for classes C, D and E
*
(b)
Air storage reservoir(s), each tank equipped with a drain and with safety and check
valves between the compressor and the last reservoir tank.
(c)
Foot control, suspended or treadle type
(d)
Air control valves
(e)
Air-pressure gage, visible to the driver
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