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conform to SAE JIO. The service brake system shall have a total air storage
capacity of not less than two times the recommended air volume for truck-
trailers in SAE J813. The reservoir shall be equipped with a remote control
or a 90-degree twist drain valve mounted on the low end of the reservoir and
positioned on the curb side of' the semitrailer accessible to personnel from
the standing or kneeling `position.  The size of the foundation brakes on each
axle shall be the same on each vehicle and the swept drum total braking sur-
face of each axle (two spindles) shall be as specified for the axle selected.
The foundation brake components shall not be overstressed or exceed the brake
component manufacturer's ratings when a full service brake application is
performed. All components of the brake system shall be located, installed,
and protected to prevent damage or malfunction from water, ground obstructions,
and debris and to obtain maximum efficiency and ease of maintenance. No part
of' the braking system shall extend below the bottom of the rim of the wheels.
An air-over-hydraulic brake system shall be furnished when an axle assembly
as specified in 3.9.6.2.1 is used.  A straight-air-brake system shall be
furnished when an axle assembly as specified in 3.9.62.2 or 3.9.6.2.4 is used.
The air reservoir shall have a
3.9.7.1 Air-over-hydraulic brake system.
ijnches.  A power cluster shall
volume capacity of not less than 1,750 CubiC
`be required for each axle on the cart-type
trailer. Multiple-axle trailers
shall be provided with either axle-by-axle
or brake-by-brake protection. The
power clusters shall be matched to the size
of the foundation brakes they
operate and shall have their high mortality
parts interchangeable with other
military-type trailers or semitrailers.
3.9.7.2 Brake lines.  The brake lines of the plant shall be routed within
the protection of the framing members and shall be secured by cushioned
support clamps at intervals not greater than 3 feet~  At each point when the
brake lines pass through metal member, the lines shall be protected by a
rubber or nylon grommet and secured, or a through-frame connector shall be
used. The routing and connection locations shall facilitate replacement of
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 permit
interchange of the various makes of MS53004 valves. The ends of these lines
shall be identified by markers conforming to MS39020 installed near the
fittings. The brake line components shall conform to the following:
(a) Flexible air line - MIL-H-3992, type I, or SAE J4O, SAE 40R2,
type E or F, having reusable fittings.
(b) Rigid air line - SAE J844 copper tubing.
(c) Fittings - SAE J512, heavy-duty, airbrake compression type,
reusable.
At the suppliers option, SAE J40, SAE 40R2, type E or F, air hose may be
furnished in Lieu of (a) and (b) above.
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