BENDIX BW1672 Fiche De Données

®

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. 

ANTILOCK CONTROLLER 

MOUNTING HOLES(4)

DELIVERY

SUPPLY 

DELIVERY

MOUNTING 

BRACKET

CONTROL

SERVICE