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|  MIL-T-62021E(AT)
(a)
Air compressor, unloader-head-type, engine driven and engine lubricated, air or
water cooled, and having a capacity of not leas than 205 L/min (7.250 cubic feet per
minute (cmf));
(b)
Air storage reservoir(s), each tank equipped with drain, and with safety and check
valves between compressor and last reservoir tank;
(c)
Foot control, suspended or treadle type
(d)
Air control valves
(e)
Air pressure gage, visible to the driver
(f)
Low-air-pressure warning, visible and audible
(g)
Service brake stop lamp switch
*
(h)
Automatic slack adjusters on cam type brakes or internal self-adjusting brakes on
wedge and disc type brakes, on all axles.
(h)
Automatic moisture ejector.
*
3.4.11.1.1 Air driver. A replaceable cartridge desiccant type air dryer shall be installed in
the air brake system. 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 and a
thermostatically controlled heater to prevent icing of the purge valve.
*
3.4.11.2 Trailer brake control system. When specified (see 6.2), in addition to the
components specified in 3.4.11.1, a trailer brake control system shall be furnished. The trailer
brake control system shall include:
(a)
Identification of emergency and service lines
(b)
Coincident control of trailer brakes with prime mover foot control
(c)
Independent hand control for trailer brakes
(d)
Prime mover protection valve with dash control and automatic breakaway feature
(e)
Trailer stoplight control operative with foot brake and with hand control for trailer
brakes
(f)
Two SAE J844 coiled air hoses, not less than 2800 mm (110 inches) long when fully
extended, with SAE J318 gladhand couplers an both ends of hoses. The hoses shall
be packaged and stowed in the vehicle tool compartment for shipment;
(g)
Air connectors for trailers with SAE J318 gladhand couplers mounted at the rear of
the vehicle located to prevent interference with trailer
(h)
Dummy gladhand couplers with chains
(i)
Prime mover only parking brake valve to permit prime mover parking brakes to be
applied while charging the trailer air brake system.
3.4.11.2.1 Brake control from a towing vehicle. When specified (see 6.2), the vehicle
shall be furnished with a system for controlling the brakes from a towing vehicle (wrecker). The
installation shall be complete with air brake couplers, relay emergency valve with no-bleed-back
feature (except when spring applied emergency brake is furnished), additional air lines and
fittings. The service and emergency couplers shall be mounted on the front in a protected position
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