Troubleshooting guide

32
www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)
Trailer Spring Brake Valves, continued
ABS Controller/
Relay Assembly
SR-5
™
Trailer
Spring Brake Valve
The TE-1
™
trailer
emergency stop light
switch is a pressure-
sensitive switch to operate
the stop lights in the event
of emergency trailer brake
application.
Typical SR-5
™
Trailer Spring
Brake Valve
Tandem Axle
Trailer Air
System
(Note simplified
system plumbing)
Service
Reservoir
Service
Reservoir
Some System
Designs Use a
Single Two-
Compartment
Reservoir
The TR-5
™
lock line control valve is a specialized,
pilot operated, non-automatic, on - off control valve,
designed primarily for use in off-highway parking and
emergency brake systems. It is almost identical in
appearance to the SV-1
™
control valve. Unlike the
SV-1
™
control valve, the TR-5
™
control valve reacts to
control pressure from two different sources and does
not have an exhaust.
The PE-4
™
control valve is most often used as the
control for off highway emergency/park brake systems.
It is essentially a variation of the TH-3
™
valve which
incorporates two TW-1
™
type valves in a single body.
A common air supply is provided for the two valves
and a single, cammed lever is used which has three
operating positions and "Z" shift pattern.
TR-5
™
Control
Valve
PE-4
™
Control
Valve