KKK-B-1579B
attachment device shall provide an ultimate strength at least equal to the GVW rating of the
vehicle furnished.
3.1.1.10 Towing brakes. Unless otherwise specified for vehicles with air brakes
(see 6.2), in addition to the brake requirements specified herein (see 3.4.11), an emergency
system for controlling at least the front brakes of the bus from a towing vehicle shall be
provided. The installation shall be complete with air brake couplers; relay emergency valve with
no-bleed-back feature, (except when spring applied emergency brake is furnished); and
additional air lines and fittings. Towing brake installation shall not compromise conformance to
any Federal Motor Carrier Safety Regulation or Federal Motor Vehicle Safety Standard
(FMVSS) referenced herein. Couplers shall be mounted in a protected location at the rear of the
bus and shall permit ready attachment of air hoses from the towing vehicle. Service coupler
shall be located on the curbside and emergency coupler on the roadside.
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3.1.1.11 Silicone brake fluid. When specified for vehicles with hydraulic brakes
(see 6.2), and if available as the manufacturer's standard or optional brake fluid, brake fluid
conforming to MIL-B-46176 shall be provided in the hydraulic brake system. A tag shall be
placed near the master cylinder stating "CAUTION: USE SILICONE BRAKE FLUID ONLY,
MIL-B-46176."
3.2 General design.
3.2.1 Federal Motor Vehicle Safety Standards. Type I, II, III and IV buses and furnished
accessories shall comply with all Federal Motor Vehicle Safety Standards in effect on the date of
manufacture, including standards applicable to only school buses; except as specified in 3.5.8
and 3.5.9, compliance with FMVSS No. 222 is not required. Type V, VI, and VII buses and
furnished accessories shall comply with all Federal Motor Vehicle Safety Standards in effect on
date of manufacture, including standards applicable to only school buses.
3.2.2 Air pollution control. The vehicle shall comply with the Environmental Protection
Agency Regulations governing Control of Air Pollution from New Motor Vehicles and New
Motor Vehicle Engines in effect on the date of manufacture. In addition, vehicles destined for
California shall comply with State of California regulations governing air pollution control in
effect on the date of manufacture.
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3.2.3 Sound level. The interior sound level at the operator's location with driver in
seated position shall be not greater than 85dB(A) when measured in accordance with
MIL-STD-1474. The vehicle exterior sound level shall conform to the Interstate Motor Carrier
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