BENDIX SD-13-4861 データシート

This Service Data sheet covers the operation, and 
replacement procedures, for both the Bendix

®

 ATR-6

™

 and 

the previous ATR-3

™

 Antilock Traction Relay valves.  These 

valves are specialized air brake valves developed for use 
on Bendix antilock/traction-equipped vehicles.

This document will refer to the ATR-6

™

 Antilock Traction 

Relay valve throughout since the ATR-3

™

 version operates 

in an almost identical way.  See Figure 1 for external 
differences.

The ATR-6

™

 Antilock Traction Relay valve is a service 

relay valve fi tted with a modifi ed cover containing a Control 
Solenoid.  It contains both air and electric components to 
provide the service braking and traction control (differential 
braking) as well as ESP

®

 advanced stability system ABS 

functions.  

Typically the ATR-6

™

 valve replaces a standard relay valve 

used to control the rear axle service brakes, though it may 
be used for both front and rear axles on some advanced 
ABS vehicle applications.  In normal operation, it performs 
the standard relay function and like the standard relay valve 
it replaces, the ATR-6

™

 valve is normally mounted near the 

service brakes it serves.  

When the ABS Controller operates the ATR-6

™

 valve, for 

example during an antilock traction event, the Control 

Solenoid is energized and permits delivery air to be 
supplied to the Antilock Modulator Valves and used as 
required by the Controller - see Operation below for a full 
explanation.

For ease of servicing, the inlet/exhaust valve can be 
replaced without the need to remove the entire valve.

All air connections on the ATR-6

™

 valve are identifi ed as 

shown below.

  Supply (to reservoir) . . . . . . . . . . . . . . . . . SUP (1) 

  Delivery (to brake chamber)   . . . . . . . . . . DEL (2) 

  Control (to brake valve rear delivery)   . . CON  (4)

The ATR-6

™

 valve is part of the R-12

™

 family of relay valves.  

The internal components of the relay portion of all of these 
valves are interchangeable with the R-12

™

 valve and the 

same basic components are used to service all of them.

The ATR-6

™

 valve is available with various crack pressures 

(the control pressure required to initiate air delivery to the 
brakes) to accommodate specifi c vehicle applications; 
however the standard is 4 psi (see Figure 7 on Page 5).

Bendix

®

 ATR-6

™ 

Antilock 

Traction Relay Valves

Bendix

®

 ATR-3

™ 

Antilock 

Traction Relay Valves

CONTROL 

PORT

DELIVERY PORTS (6)

2 PIN 

SOLENOID

CONNECTOR

SUPPLY 

PORT

COVER

CONTROL 

SOLENOID

ESP

®

 is a registered trademark of Daimler and is used by BCVS under license

.