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Bendix
®
ATR-2
™
CONTROLLER OR COVER
PLATE MOUNTING HOLES:
SEE NOTE
MOUNTING
BRACKET
BODY
SUPPLY PORT
NOTE: AN OPTIONAL COVER PLATE IS INSTALLED OVER THE TOP WHEN THE
ATR-2
™
VALVE IS MOUNTED REMOTE FROM THE ANTILOCK TRACTION CONTROLLER
FIGURE 1 - ATR-2
™
ANTILOCK TRACTION RELAY VALVE
DESCRIPTION
The ATR-2
™
antilock traction relay valve is a specialized air
brake valve developed for use on Bendix antilock/traction
equipped tractors only.
It is essentially three separate valves working in combination
in a single housing. An R-14
the base valve and is fitted with a modified cover containing
a bobtail tractor brake proportioning valve (reference Bendix
Service Data Sheet SD-03-1067) and a traction control
solenoid. The ATR-2
™
valve contains both air and electric
components and provides both the service braking and
traction control (differential braking) functions. A Bendix
antilock traction controller can be mounted to the ATR-2
valve or a cover plate can be installed and the antilock
controller mounted elsewhere on the vehicle.
The ATR-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 ATR-2
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 ATR-2
provides added vehicle braking control and reduces the
number of times antilock is actually needed.
AntiLock Traction Relay Valve
BOBTAIL
PROPORTIONING
VALVING
™
style service relay valve is
™
valve reduces brake
SERVICE PORT
CONTROL PORT
DELIVERY PORT (4)
Like the standard relay valve it replaces, the ATR-2
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 ATR-2
are identified with cast, embossed letters for ease of
identification and installation. The letter identification and
air line connections are shown below for reference.
ATR-2
™
VALVE
AIR CONNECTION
Supply (to reservoir)
™
Delivery (to brake chamber)
Service (to brake valve rear delivery)
Control (to delivery of trailer supply valve)
The ATR-2
™
valve is part of the R-12
which includes the R-12
The internal components of the relay portion of all of these
valves are interchangeable with the R-12
™
valve
the same basic components are used to service all of them.
The ATR-2
™
valve is available with various crack pressures
to accommodate specific applications, however the standard
is 4 psi.
TRACTION CONTROL
SOLENOID
COVER
SUPPLY
PORT
2 PIN SOLENOID
CONNECTOR
EMBOSSED IDENT.
™
family of relay valves
™
, R-14
™
, BP-R1
™
, AR-1
™
valve and therefore
™
valve
™
valve
SUP
DEL
SER
CON
™
valves.