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|  MIL-T-83808
(84)
e. The master cylinder shall be the dual compartment reservoir, two piston type. The front set
of wheels shall be independently supplied from one side of the reservoir and the rear set of
wheels shall be independently supplied from the other compartment of the master cylinder
reservoir. A red warning light shall be mounted on the dash and shall illuminate when either
compartment of the brake master cylinder is low on hydraulic brake fluid.
f. Means shall be provided to bring an unloaded tractor to a stop in 30 feet with a maximum
of 150 pounds foot pressure in the event of an engine off situation at 20 MPH.
g. Under maximum brake effort, all four wheels shall lock simultaneously and shall remain
locked while the tractor is being dragged on dry concrete with a coefficient of friction of 0.75.
h. In the event of engine failure, the boost (assist) to the service brake system shall be main-
tained for at least one brake application and be capable of stopping the vehicle within the
limits specified herein. After the boost (assist) is no longer available to the service brake
system, an operator shall be capable of stopping the vehicle with a maximum of 130 pounds
pedal effort.
The parking brake, together with the towed vehicle parking brake, shall be
3.3.4.4
Parking brake.
capable of holding the fully loaded towing and towed vehicle combination on an 11.5 incline with the tow
vehicle headed up or down while the transmission is placed in the lowest gear and reverse gear with the
engine idling. The parking brake shall hold the vehicle in this position for an indeterminate amount of time.
Physical arrangement shall be such that at least three inch clearance shall be provided for operation by
an operator wearing arctic gear.
cial trailer air connection. When specified (see 6 2), the vehicle shall be furnished with the
3.3.45
following additional equipment for special trailer operation.
3.3.4.5.1 Air system. The vehicle shall be equipped with an air system designed for an operating
pressure range of 95 pounds per square inch (psi) to 105 psi. The air system shall consist of an air com-
pressor, air compressor governor, front and rear air couplings, low air pressure warning buzzer, pressure
gauge, air reservoir and all required piping. The air system shall be equipped with automatic water drain
systems in both the wet and dry tank such that moisture entering the system shall be eliminated to prevent
excessive water accumulation in the air tanks, piping and other related components The air system shall
be equipped with an alcohol injection system or desiccant filter.
3.3.4.5.1.1 Air compresso r. The air compressor shall have a capacity of not less than 7 CFM and shall be
provided with a suitable unloading mechanism for pressure relief when the system IS fully charged The
air compressor shall also be capable of increasing the air pressure in the supply and service reservoirs
from 90 psi to 110 psi, when the engine is operating at the vehicle manufacturer's maximum recom-
mended rpm, within a time span of not more than 25 seconds. The air compressor governor shall ade-
quately maintain pressure in the air reservoir tank within normal operating ranges by controlling the
compressor unloading mechanism. A means to adjust drive belt tension shall be provided on belt driven
compressors. The air compressor shall not vibrate excessively under load
3.3.4.5.1.2 Air co nnect ors Two air line connectors shall be provided in a suitable location at the rear of
the vehicle and two at the front of the vehicle The couplings shall be properly connected to the air supply
system as required by DOT regulations Dummy caps shall be provided and shall be securely attached to
the vehicle to prevent their loss The couplings shall suitably connect with trailer couplings and shall
permit operation of towed load air brakes by use of the tow vehicle service brakes. Air line connectors
shall comply with SAE J318 Furthermore, means shall be provided to prevent loss of air through connec-
tors when not coupled to a trailer (i.e., a manually operated shutoff valve immediately upstream would
suffice). The air connectors (couplers) shall be mounted in a location to prevent possible damage from
wheel chocks being placed on the rear of the vehicle
3.3.4.5.1.3. Co ntrol mecha nism, Control of the towed load brakes shall be through the tow vehicle service
brake pedal. Means shall be provided so the towed load shall be activated at least 0 3 seconds and no
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