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|  MIL-T-62531(AT)
4.7.5.1 Service brakes. To determine conformance to 3.7.5.1, application of service brakes
shall stop, hold, and control the vehicle when ascending and descending a 60 percent grade. On
relatively level, dry concrete roadway, application of service brakes shall bring the vehicle to a
complete stop, from a speed of ______ km/h, within ______ m, measured from point of brake
application. When conducting the brake tests the vehicle shall be centered in a 3.7 meter wide
roadway lane and no part of the vehicle shall deviate from the lane when conducting the braking
tests. The brake test shall be repeated for 40 consecutive stops.
4.7.5.2 Parking brake. To determine conformance to 3.7.5.2, the parking brake shall be
capable of holding the vehicle motion and, at GVW on a 40 percent grade either headed up or
downgrade, on dry hard surface that is free from loose material, in accordance with
MIL-STD-1180. An indicator light will be provided to alert the crew when the parking brake is
engaged. This energy shall be isolated from any common source and used exclusively for the
operation of the parking brake. The parking brake system shall be held in the applied position by
energy other than fluid pressure, air pressure, or electric energy. The parking brake shall be such
that it cannot be released unless adequate energy is available upon release of the parking brake to
make immediate further application. "Park" position (transmission shift lever) is required.
"Park" position mode must comply with the above parking brake requirements including release
of "Park" mode on a 40 percent grade.
4.7.5.3 Emergency brakes. To determine conformance to 3.7.5.3, the emergency brake
system, in the event of a single point failure in the service brake system, shall be able to stop the
vehicle and be capable of being modulated by the service brake control. Emergency braking
shall include a means of providing adequate stopping in the event of a trailer breakaway.
4.7.6 Cramping angle test. To determine conformance to 3.7.6, the front wheels shall be
turned to maximum right and left positions and, to assure that the degree turning angle is met,
there shall be no clearance between traces of the axle stops. Faces of stops must contact each
other simultaneously. The inside face of the tire shall not contact any part of the chassis, frame
or vehicle components.
4.7.7 Cruising range. To determine conformance to 3.7.7, the vehicle fully loaded shall be
driven on hard surface roads, over average rolling terrain, at an average road speed of
______ km/h, for a distance of not less than ______ km, without refueling.
4.7.8 Ground clearance. To determine conformance to 3.7.8, position the rated payload
properly and measure the distance from the lowest part of the vehicle to the ground excluding the
wheels and tires. The clearance shall not be less than ______ cm.
4.7.9 Ramp angle. To determine conformance to 3.7.9 the vehicle shall ascend, advance
over the crest and descend a ______ degree ramp surface without any part of the vehicle, except
the tires, touching the ground.
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