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|  MIL-T-46797B(AT)
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3.4.10.3 Spare wheel or rim. When specified (see 6.2), a spare wheel or rim shall be
furnished and stowed on the vehicle. When a spare tire assembly is specified (see 3.4.10.4), a
spare wheel or rim shall be furnished. The spare wheel or rim shall be the same as mounted on
the front and rear axles.
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3.4.10.4 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 wheel or rim shall be the same size tread design and ply rating as the
tires furnished on the vehicle.
3.4.10.5 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.
3.4.11.1 Service brakes. The vehicle shall be equipped with full-air brakes. The braking
system, complete with all necessary components, shall include:
(a) Air compressor, unloader-head-type, engine driven and engine lubricated, air or
water cooled, and having a capacity of not less than 7 1/4 cubic feet per minute
(cfm)
(b) Air storage reservoir(s) with not less than 2,000 cubic inches total capacity, each
tank equipped with drain, and with safety and check valves between compressor and
last reservoir tank
(c) Foot control, suspended or treadle type
(d) Air control valves
(e) Air pressure gage, visible to the driver
(f) Low-air-pressure warning, visible and audible
(g) Service brake stop lamp switch
(h) Alcohol aspirator, with unbreakable transparent container
(i) Automatic moisture ejector.
(j) When specified (see 6.2), in lieu of subparagraph (h), an air dryer shall be furnished.
The air dryer shall be of the desiccant type.
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(k) When specified (see 6.2), automatic slack adjusters shall be furnished.
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