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service and emergency couplings (front and rear), relay emergency valve, air reservoir, cylinders
or chambers, foundation brake assemblies on each wheel, and all other components and
plumbing required for a complete, matched airbrake system. All brake system components and
plumbing shall be located, installed, and protected to prevent damage or malfunction from
ground obstructions and debris when transported, from falling aggregate when operating, and to
obtain maximum efficiency and ease of maintenance. Service and emergency couplings shall be
furnished and shall conform to MS35746, except that they shall be of the polarized or
noninterchangeable type, color coded blue for service and red for emergency. A spring-type,
metal dust cover shall be installed on each coupling to prevent contaminants from entering the
opening. The dust cover shall not cause interference when another coupling with a dust cover is
connected. In addition, metal identification tags conforming to MS53007 shall be installed near
each front and rear fixed coupling. The relay emergency valve shall conform to MS53004,
except that the rapid bleed-down vent shall not be furnished with these straight airbrakes. The
air reservoir shall conform to SAE J10 and shall have an air storage capacity of not less than two
times the minimum recommended air volume for truck-trailers as specified in SAE J813. The
reservoir shall be equipped with a remote control or a manual, 90 degree twist drain valve,
mounted on the low end of the reservoir. The remote control for the drain valve shall be on the
curb side of the semitrailer and shall be accessible to personnel from the standing or kneeling
position. The foundation brake assemblies shall be not less than 12.25 by 7.5-inch size. The
brake lining shall be of the metallic type having nonfading characteristics when subjected to heat
and to water immersion. The lining shall be Class Code FE in accordance with Regulation V-3
of the Vehicle Equipment Safety Commission. The lining shall be selected by the supplier and
shall be of standard size as listed in the Automotive Data Book of the Friction Materials
Standards Institute, Inc. The lining segments shall be not less than 3/4-inch nominal thickness.
The brake lining shall be installed on the shoes by the use of hardened steel bolts and nuts, as
recommended by the lining manufacturer. All metal surfaces enclosed by the brake drum and
the dust shields shall be coated with lacquer-primer conforming to MIL-P-46093 or TT-P-664.
Wedges, pins, cams, rollers, and anchors shall be coated with preservative oil conforming to
MIL-L-21260, grade 2. Brake lines. The brake lines shall be routed within the protection of the semitrailer
framing and shall be secured by cushioned support clamps spaced at intervals not greater than
3 feet. Through-frame connections or grommets used in conjunction with clamps shall be
required where lines pass through sheet metal or framing members. The routing and connection
locations shall facilitate replacement for the lines from bulk supply. Not less than 5 inches of
slack in flexible air hose shall be provided at each of the relay emergency valve connections to

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