Bendix Commercial Vehicle Systems AR-2 ANTILOCK RELAY VALVE 8/11 - Manual

1
®
SD-13-4796
FIGURE 1 - AR-2 ™ ANTILOCK RELAY VALVE ASSEMBLY
DESCRIPTION
The Bendix ® AR‑2 ™ antilock relay is a specialized air brake
valve developed for use on antilock equipped tractors only.
It is essentially a BP‑R1 ® “bobtail” brake proportioning relay
valve (Bendix Service Data Sheet SD‑03‑1067) with a
modified cover that permits direct attachment of a Bendix ®
antilock controller such as the EC‑15 ™ . When combined
with an antilock controller the resulting assembly is referred
to as a antilock controller relay assembly. For example
when the AR‑2 ™ valve is combined with the EC‑15 ™
electronic controller, the resulting assembly is referred to
as a CR‑16 ™ controller relay assembly.
While it is intended for use on antilock equipped tractors,
the AR‑2 ™ valve functions solely as an air brake relay and
contains no electronics of its own.
The AR‑2 ™ valve replaces the standard relay valve used
to control the rear axle service brakes and performs the
standard relay function during tractor‑trailer operation.
During tractor bobtail operation, the AR‑2 ™ valve reduces
brake application pressure to the lighter rear axle(s) brakes
to improve vehicle controllability and minimize rear axle(s)
wheel skid before antilock is required. The AR‑2 ™ valve
provides added vehicle braking control and reduces the
number of times antilock is actually needed.
Like the standard relay valve it replaces, the AR‑2 ™ valve
and its attached antilock controller is normally mounted
near the service brakes it serves. A mounting bracket,
furnished with the valve, permits either frame or cross
member mounting. All air connections on the AR‑2 ™ valve
are identified with cast, embossed letters for ease of
identification and installation.
Bendix ® AR-2 ™ AntiLock Relay Valve
ANTILOCK CONTROLLER
MOUNTING HOLES(4)
DELIVERY
SUPPLY
DELIVERY
MOUNTING
BRACKET
CONTROL
SERVICE