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|  MIL-T-62491C
3.4.10.4 Spare wheel or rim. When specified (see 6.2), a spare wheel or rim shall be
furnished. When a spare tire assembly is specified (see 3.4.10.5), a spare wheel or rim shall be
furnished.
3.4.10.5 Spare tire assembly. When specified (see 6.2), a spare tire assembly shall be
furnished. The spare tire assembly shall include an inflated spare tire mounted on the spare wheel
or rim. The spare tire shall be of the same size, tread design and load range (ply rating) as the
tires furnished on the front axle of the vehicle.
3.4.10.6 Tire chain clearance. Tire chain clearance in accordance with SAE J683 shall be
provided. Allowance for spring deflection shall be included.
3.4.11 Brakes. Brakes shall conform to Federal Motor Carrier Safety Regulations 393.40
through 393.43 and 393.45 through 393.52. The vehicle shall be equipped with full air brakes,
except that class 10 vehicles shall be furnished with power-assisted hydraulic brakes. Brakes shall
be furnished on all wheels. Brake linings shall be of nonasbestos material on all front axles, on
single rear axles rated at 10 430 kg (23,000 pounds) or less and on tandem rear axles rated at
20 900 kg (46,000 pounds) or less.
3.4.11.1 Split hydraulic brake system. The power-hydraulic brake system shall be so
arranged as to provide separate systems for at least two wheels and so designed and constructed
that rupture or leakage type failure of any single pressure component of the service brake system,
except structural failures of the brake master cylinder body, effectiveness indicator body, or other
housing common to the divided system, will not result in complete loss of function of the vehicle
brakes when force on the brake pedal is continued. "Pressure component" means any internal
component of the brake master cylinder or master control unit, wheel brake cylinder, brake line,
brake hose, or equivalent, except power assist components.
3.4.11.1.1 Indicator light. The split hydraulic brake system shall be equipped with an
electrically operated red light mounted on the instrument panel to indicate system effectiveness.
The light shall have an area of not less than 125 square millimeters (mm2) (0.196 square inch). It
shall illuminate before or upon application of the brakes when an actuating-pressure component of
the system has sustained a loss of pressure. The indicator light system shall include a means for
testing by the vehicle operator to assure that the light bulb is operable.
3.4.11.2 Air brakes. Air brakes shall be complete with all necessary components, including
the following:
(a) Air compressor, unloader-head type, engine driven and engine lubricated, air or water
cooled, and having a capacity of not less than 205 L/min (7-1/4 cubic feet per minute
(cfm)) for model 4x2 and 4x4 and not less than 340 L/min (12 cfm) for model 6x4
and 6x6
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