MIL-STD-1365C
5.2.3 Functional.
5.2.3.1 Brakes.
5.2.3.1.1 Parking brakes. Trailers and towed vehicles shall be equipped with manually applied parking brakes which shall be capable of locking the wheels so that:
a. When a towing force of sufficient magnitude is applied, the braked wheels of the trailer or towed vehicle shall skid, not roll, on dry level concrete.
b. The fully loaded equipment shall remain motionless on a dry incline of 20 percent (11.5 degrees).
5.2.3.1.2 Service brakes. Trailers and towed equipment shall be equipped with service brakes meeting the following requirements:
a. The brakes shall be capable of stopping the fully loaded vehicle traveling on a level concrete surface at 20 mph within 30 feet after brakes have been applied. The service brake shall operate smoothly and uniformly, and the trailer shall exhibit no tendency to jackknife.
b. The service brakes shall be capable of holding the trailer motionless and control it whether headed up or down a dry incline of 20 percent (11.5 degrees).
c. The service brakes shall be automatically applied in synchronization with the braking action of the towing vehicle.
5.2.3.1.2.1 Breakaway stopping. The brake system shall assure that, in the event the trailer is separated from the towing vehicle, the trailer service brakes will be automatically energized to stop the trailer in not more than 150 percent of tow vehicle/trailer stopping distance at rated load.
5.2.3.1.2.2 Back-up (if required). While the trailer is subjected to a back-up force, the service brakes shall momentarily hold, but with continued force shall release and allow unrestricted rearward travel.
5.2.3.1.3 Surge brakes. A trailer surge brake system, when used, shall provide smooth proportional braking action when the towing vehicle is decelerating on down-grades. The system shall have a bypass provision to permit the trailer to move rearward, with a maximum delay of one second after application of the rearward force.
5.2.3.1.3.1 Breakaway (if required). When equipped with surge brakes, the vehicle shall be capable of meeting the following requirements. On a dry level brushed concrete surface, free of loose material, and with the breakaway lever of the surge brake positioned to apply the brakes, the loaded trailer shall be subjected to a towing force sufficient to move the trailer for a minimum distance of 5 feet to determine that the wheels will skid and not roll.
5.2.3.1.3.2 Inadvertent actuation. The surge brake actuator shall incorporate provisions to prevent premature or intermittent brake action resulting from uneven road surfaces and/or trailer pitching.
5.2.3.2 Towing force. The trailer shall demonstrate capability to roll under a maximum towing force of 2½ percent of its maximum gross weight when tested as follows. A prime mover shall be used to apply a gradual towing force through a dynamometer or other suitable force measuring device placed between the prime mover and the towbar of the vehicle, and the tow force shall be measured to determine compliance with the requirement. This evaluation shall be conducted with the trailer fully loaded on a dry, level, concrete surface free of loose material.
5.2.3.3 Design proof load. The trailer shall be subjected to a test load (see table I) with the trailer supported in such a manner that the load will not be carried by the tires. Evidence of permanent deformation shall be cause for rejection.
5.2.3.4 Mobility. Requirements for mobility shall be as determined by the procuring activity or as defined in the development specification (see 6.2). Guidance regarding mobility concerns may be found in SAE-AS8090.
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