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|  MIL-T-62735
3.3.15.2 Air brakes. When specified (see 6.2), other class 21 and smaller vehicles shall
have full air brakes. All other vehicles shall have full air brakes. Model 8x4 and 8x6 vehicles
shall meet FMVSS stopping distance requirements with the pusher axle up and with the pusher
axle down, all while loaded to specified GVW and GCW. The air brake system shall be
complete with all standard and necessary components and as required by safety regulations and
standards, including the following:
(a) Air compressor rated capacity not less than as specified in table IX.
(b) Unless otherwise specified (see 6.2), an automatic moisture ejector
(c) Unless otherwise specified (see 6.2), for 4x2, 6x4 and 8x4 models, automatic slack
adjusters on cam type brakes or internal self-adjusting brakes on wedge and disc
type brakes; except these features shall not be on any axle on a vehicle when it is not
available on all axles of the vehicle as follows:
(1) A single rear axle vehicle with a rear axle rated at over 10 430 kg
(23,000 pounds),
(2) A tandem rear axle vehicle with a rear axle rated at over 20 900 kg
(46,000 pounds).
TABLE IX. Air compressor capacity.
Capacity L/min (ft3/min)
Class
Truck
Truck tractor
Up to 32
205 (7.25)
340 (12)
33 to 52
340 (12)
340 (12)
53 and up
510 (18)
510 (18)
3.3.15.3 Air dryer. The air brake system shall have a replaceable cartridge desiccant
type air dryer. The dryer shall have the capability of removing not less than 95 percent of the
moisture in the air being dried. The dryer shall have a pre-cooler and a filter to screen out oil
and solid contaminants. The dryer shall have an automatic self-cleaning cycle. The dryer shall
have a thermostatically controlled heater to prevent icing of the purge valve.
3.3.15.4 Trailer brake control system. In addition to the components specified in 3.3.15
through 3.3.15.3, air brake vehicles shall be designed and produced to accommodate ready
installation of a trailer brake control system conforming to 3.5.21. When a trailer brake control
system is required, the vehicle shall have air brakes.
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