A-A-58003F
c. Automatic moisture ejector on air storage reservoir.
d. Automatic slack adjusters on cam brakes or internal self-adjusting brakes on wedge
and disc brakes on all axles.
e. Spring set parking brakes.
f. All components of the braking system shall be installed in such a manner as to provide
adequate road clearance when traveling over uneven or rough terrain, including objects
liable to strike and cause damage to the brake system components. No part of the braking
system shall extend below the bottom of wheel rims, to ensure, in case of a flat tire, that
the weight of the vehicle will be supported by the rim and the flat tire and not be imposed
on any component of the braking system. Slack adjusters and air chambers shall be
located above the bottom edge of the axle carrier.
2.3.3.1 Air dryer. A replaceable cartridge desiccant 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.
2.3.3.2 Compressed air shoreline. A flush mounted, checked, auto-eject compressed air
shoreline connection shall be provided to maintain brake system pressure while the vehicle is not
running. It shall be located on the exterior of the vehicle, either adjacent to the driver's door or
within 6 inches of the left side front corner of the body. An air chuck shall be provided as loose
equipment.
2.3.3.3 Auxiliary braking system. The service brakes shall be augmented by one of the following
auxiliary braking systems:
a. A system which opens all or some of the engine exhaust valves near the end of the
compression stroke, thereby converting vehicle motion to a pumping loss. The engine
brake shall be approved by the engine manufacturer.
b. A hydrodynamic retarder integral with the transmission.
c. A controlled gate valve in the exhaust manifold, which produces engine back pressure.
The exhaust brake shall be approved by the engine manufacturer.
d. A dash mounted switch shall be provided to activate, modulate, or cut out the brake
augmentation. The switch shall be marked to indicate its position. When active, the
system shall be fully controlled by means of the conventional driving controls to apply
retardation during vehicle deceleration, and to cut it out in the other operating modes.
2.3.4 Tires and wheels.
2.3.4.1 4x2 version. The 4x2 version shall be equipped with single tires on the front axle and
dual tires on the rear axle. The vehicle shall be equipped with tubeless steel radial tires with
on/off-road type tread mounted on steel disc wheel assemblies. If all tire and wheel assemblies
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