BENDIX BW2271 Manuel D’Utilisation

The Bendix

®

 SR-7

®

 spring brake modulating valve is used 

in conjunction with a dual air brake system and spring brake 
actuator and performs the following functions:

1.  Provides a rapid application of the spring brake actuator 

when parking.

2.  Modulates the spring brake actuator application using 

the dual brake valve should a primary failure occur in 
the service brake system.

3.  Prevents compounding of service and spring forces.

The valve has one park control, one service control, one 
supply, one balance, four delivery NPTF ports, and an 
exhaust port protected by an exhaust diaphragm.  The 
valve incorporates two mounting studs for mounting the 
valve to the frame rail or cross member (where applicable).

MOUNTING 

STUDS (2)

EXHAUST

42

CONTROL 

PORT

2

DELIVERY

1

SUPPLY PORT

41

BALANCE 

PORT

3

EXHAUST

2

DELIVERY 

4-1

PARK CONTROL

(FROM DASH VALVE)

PIPE PLUG

(INCLUDED IN QUICK 

RELEASE VALVE 

APPLICATIONS)