KKK-B-1579B
secure the spare wheel in the carrier, shall be constructed of or plated with corrosion-resistant
material. The carrier design shall enable removal or mounting of spare wheel assembly using
only tools specified in 3.4.15. When specified (see 6.2), a winch type carrier shall be furnished.
3.4.10.6 Spare tire assembly. Unless otherwise specified (see 6.2), an inflated spare tire
mounted on the spare wheel or rim shall be furnished. The spare tire shall be of the same size,
tread design and load range (ply rating) as the tires furnished on the vehicle. When mud and
snow tires are required, spare tire tread shall be mud and snow design (Civil Agencies only).
3.4.11 Service brakes. Unless otherwise specified (see 6.2), type I and II shall be
equipped with hydraulic brakes; type III, IV, and V shall be furnished with air brakes and type
VI and VII shall be equipped with air or hydraulic brakes. Brakes shall conform to Federal
Motor Carrier Safety Regulations 393.40 through 393.42 and 393.44 through 393.52.
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3.4.11.1 Hydraulic brakes. Hydraulic brakes, shall be power assisted, hydraulic
actuated, four wheel service brakes.
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3.4.11.1.1 Split hydraulic brake system. Vehicles equipped with power assisted
hydraulic brakes shall be equipped with a service brake system 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 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 vacuum assist components.
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3.4.11.1.2 Indicator light. 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 0.196 square inches. It shall illuminate before or
upon application of the brakes when 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.
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3.4.11.2 Air brakes. Air brakes shall be of the four-wheel full air application type. The
braking system, complete with all necessary components, shall include:
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