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|  MIL-T-62491C
(b) Air storage reservoir(s); each tank shall be 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
(f) Low air-pressure warning, visible and audible
(g) Service brake stop lamp switch
(h) Automatic moisture ejector
(i) Automatic slack adjusters on cam type brakes or internal self-adjusting brakes on wedge
and disc type brakes (except on models 4x4 and 6x6).
3.4.11.2.1 Air dryer. 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.
3.4.11.3 Trailer brake control system. In addition to the components specified in 3.4.11.2
and 3.4.11.2.1, a trailer brake control system shall be furnished, except on class 10 and class 21
vehicles. 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 break-away feature
(e)
Trailer stoplight operable with the foot brake and with a hand control for trailer brakes
(f)
Two SAE J844 coiled air hoses, not less than 2800 mm (110 inches) long, with
SAE J318 gladhand couplers on both ends of hoses. The hoses shall be packaged and
stowed in the vehicle tool compartment for shipment
(g) Air connectors for a trailer with SAE J318 gladhand couplers mounted at the rear of the
vehicle, located to prevent interference with a 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 (with air or air-hydraulic brakes).
3.4.11.4 Brake controls for use from a towing vehicle. When specified (see 6.2), except for
class 10, the vehicle shall be furnished with a system for controlling the brakes from a towing
vehicle (a second wrecker). The installation shall be complete with air brake couplers, relay
emergency valve with no-bleed-back feature (except when spring applied emergency brakes are
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