A-A-58004F
specified above. The suspension system shall include rear axle torque rod/axle configuration
which allows for vehicle flexibility to traverse uneven off-road terrain.
2.3.2 Engine. The truck shall have a diesel engine that is certified to comply with the
Environmental Protection Agency (EPA) on-highway emission requirements at the time of
manufacture. The engine shall run on Ultra Low Sulfur Diesel Fuel unless otherwise specified
(see 6.2).
2.3.2.1 Fuel filters. Primary and secondary fuel filters and a fuel/water separator shall be
provided. The fuel/water separator shall include a water coalescer and a drain valve that is
readily accessible by an operator or a mechanic and shall be in accordance with SAE J1839. A
combination fuel filter and fuel/water separator may be provided. Fuel filter elements shall be
easily replaceable by a mechanic without loss of engine prime.
2.3.3 Exhaust system. The exhaust system outlet(s) shall be directed away from personnel
accessing equipment compartments or the tank manhole access ladder.
2.3.4 Brake system. The tanker shall be equipped with an all-wheel antilock brake system; the
brakes shall be fully air-actuated. Brakes shall be in accordance with Code of Federal
Regulations (CFR) 49 CFR 393.40 through 393.42(b) and 393.43 through 393.52. The braking
system complete with all necessary components shall include:
a. Air compressor having a capacity of not less than 12 standard cubic feet per minute
(scfm).
b. Air storage reservoir(s), each tank equipped with drain, and with safety and check
valves between the compressor and the reservoir tank. Tank drains shall be
appropriately labeled.
c. At least one automatic moisture ejector shall be provided in the system.
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.
2.3.4.1 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% of the moisture in the
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