A-A-58009B
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.
2.2.4.1 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.
2.2.4.2 Compressed air shoreline. A 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 6.0-inches of
the left side front corner of the body.
2.2.4.3 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.
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.
2.2.5 Tires and wheels. The vehicle shall be equipped with single tires and wheels on both the
front and rear axles. The vehicle shall be equipped with tubeless steel radial tires with on/off-
road type tread mounted on steel disc wheel assemblies. Tire and wheel assemblies shall be
identical at all positions. A spare tire and wheel assembly shall be provided; however, it is not
required to be mounted on the vehicle.
2.2.6 Fenders. Rear fenders and fender liners having tire chain clearance shall be provided.
2.2.7 Steering. The vehicle shall be equipped with power steering.
2.2.8 Transmission. A fully automatic transmission with a hydraulic torque converter and at least
five forward speeds shall be provided. The normal driving range selector position shall provide
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