5
When the treadle is fully applied, the reading on the test
gauge should fall off to zero promptly when the application
is released. It should be noted that the primary circuit
delivery pressure will be about 2 psi greater than secondary
circuit delivery pressure with primary and secondary circuit
supply reservoirs at the same pressure. This is normal in
this valve.
IMPORTANT
An increase in stopping distance or a low pressure warning
indicates a malfunction in one or the other brake circuit,
and although the vehicle air brake system may continue
to function, the vehicle should not be operated until the
necessary repairs have been made and both braking
circuits are operating normally.
LEAKAGE CHECK
1. Make and hold full brake application.
2. Coat the exhaust port and body of the brake valve with
soap solution.
3. Leakage is not to exceed a 1” bubble in 3 seconds in
both the applied and released position.
If the brake valve does not function as described above or
leakage is excessive, it is recommended that it be replaced
with a genuine Bendix
®
new or remanufactured unit,
available at your local authorized Bendix
®
parts outlet.
REMOVAL (IF NECESSARY)
1. Block the wheels or hold the vehicle by means other
than air brakes and exhaust air pressure from reservoirs
supplying air to the E-7
™
valve.
2. In most installations, the E-7
™
brake valve internal parts
may be removed and replaced by removing the three
cap screws which hold the pedal assembly in place and
removing the pedal assembly. The internal parts may
then be removed from the E-7
™
valve as described in
disassembly.
3. If it is necessary to remove the E-7
™
valve from the
engine compartment bulkhead, identify the two supply
and two delivery lines to their respective ports as
connected to the brake valve. There may also be air
lines to other brake devices inside the cab, which
should be properly identifi ed before disconnecting. In
the case of a manifold type installation, the three cap
screws which hold the manifold to the brake valve may
be removed and the brake valve removed.
DISASSEMBLY (REFER TO FIGURE 2)
1. Remove retainer, (18). Remove the lower static piston
assembly.
2. Fashion a hook from a piece of wire and insert hook
through inlet-exhaust valve of upper static piston
assembly. Pull fi rmly and remove upper static piston
assembly.
FIGURE 4 - TYPICAL PIPING SCHEMATIC
QUICK
RELEASE
VALVE
TP-5
™
TRACTOR
PROTECTION VALVE
MV-3
®
MANIFOLD
VALVE
BRAKE
CHAMBER
SLACK
ADJUSTER
COMPRESSOR
SUPPLY
RESERVOIR
#1 SERVICE
RESERVOIR
#2 SERVICE
RESERVOIR
DOUBLE
CHECK
VALVE
SPRING
BRAKES
SLACK
ADJUSTER
DUAL BRAKE
VALVE
TRAILER
CONTROL
VALVE
BP-R1
®
BOBTAIL
PROPORTIONING
VALVE
AIR DRYER
(32 strony)
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