BENDIX VM-1 Manual
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®
™
Bendix
TP-4
Tractor Protection Valve (Formerly VM-1)
SECONDARY
DELIVERY PORT
FIGURE 1 EXTERIOR VIEW
10
9
FIGURE 2 SECTIONAL
DESCRIPTION
®
™
The Bendix
TP-4
tractor protection valve is used in the
dual air brake system and houses three valves that serve
the trailer and tractor braking system. The valves are:
1. The trailer service line shut off portion of tractor
protection system which operates in conjunction
with the dash-mounted PP-3
manually or automatically close and retain suffi cient air
pressure in the towing vehicle to stop it with its service
brakes.
PRIMARY CIRCUIT
DELIVERY PORT
(PCD)
CIRCUIT
(SCD)
SERVICE STOP
LIGHT SWITCH
(SLS) PORT
TRAILER SERVICE
SUPPLY PORT (TSS)
4
11
13
™
trailer supply valve to
TRAILER EMERG. STOP
LIGHT SWITCH (TE-SLS)
PORT
TRAILER EMERG.
SUPPLY (TES) PORT
2
8
3
VENT
12
6
7
PIPE PLUG
5
14
2. A double check valve which permits either primary or
secondary circuit air pressure from the dual brake valve
to actuate trailer brakes.
3. A double check valve which permits use of a trailer
control valve to control only the trailer brakes.
In addition to the ports necessary for the function of the
above described valves, the manifold also provides ports
for the installation of the service stop light switch, front
axle limiting control valve, and the TE-1
stop light switch.
Four 23/64" holes are provided for mounting.
MOUNTING
SURFACE
VENT
™
trailer emergency
1
16
15
1