4
Every 3 months, 25,000 miles, or 900 operating
hours:
Clean any accumulated dirt, gravel, or foreign material
away from the heel of the treadle, plunger boot, and mount-
ing plate.
Lubricate the treadle roller, roller pin, and hinge pin, with
Barium grease per BW-204-M (Bendix part 246671).
Check the rubber plunger boot for cracks, holes, or dete-
rioration and replace if necessary. Also, check mounting
plate and treadle for integrity.
Apply a thin layer of Barium grease, per BW-204-M (Bendix
part 246671), between plunger and mounting plate –
do
not over oil!
SERVICE CHECKS
OPERATING CHECK
Check the delivery pressure of both primary and secondary
circuits using accurate test gauges. Depress the treadle
to several positions between the fully released and fully
applied positions, and check the delivered pressure on the
test gauges to see that it varies equally and proportionately
with the movement of the brake pedal.
After a full application is released, the reading on the test
gauges should fall off to zero promptly. It should be noted
that the primary circuit delivery pressure will be about 2
PSI greater than the secondary circuit delivery pressure
with both supply reservoirs at the same pressure. This is
normal for this valve.
Important:
A change in vehicle braking characteristics or a
low pressure warning may indicate 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, including the pneumatic and
mechanical devices, are operating normally. Always
check the vehicle brake system for proper operation after
performing brake work and before returning the vehicle
to service.
LEAKAGE CHECK
1. Make and hold a high pressure (80 psi) application.
2. Coat the exhaust port and body of the brake valve with
a soap solution.
3. Leakage permitted is a 1" bubble in 3 seconds. If the
brake valve does not function as described above or
leakage is excessive, it is recommended that it be
replaced with a new or remanufactured unit, or repaired
with genuine Bendix parts available at authorized
Bendix parts outlets.
Refer to fi gures 4, 5 and 6 for item numbers referenced
in parenthesis.
REMOVAL
1. Chock the vehicle wheels or park the vehicle by
mechanical means. (Block and hold vehicle by means
other than air brakes.) Drain all air system reservoirs.
2. Identify and disconnect all supply and delivery lines at
the brake valve.
3. Remove the brake valve and treadle assembly from
the vehicle by removing the three cap screws on the
outer bolt circle of the mounting plate. The basic brake
valve alone can be removed by removing the three cap
screws on the inner bolt circle.
DISASSEMBLY
(Figures 4, 5 and 6)
1. If the entire brake valve and treadle assembly was
removed from the vehicle, remove the three cap
screws securing the treadle assembly to the basic
brake valve.
2. Remove the screw (9) securing the exhaust diaphragm
(10) and washer (11) to the exhaust cover (12).
3. Remove the four screws that secure the exhaust cover
(12) to the lower body.
4. Remove the secondary inlet and exhaust valve
assembly (13) from the lower body.
5. Remove the four hex head cap screws securing the
lower body to the upper body and separate the body
halves.
6. Remove the rubber seal ring (14) from the lower
body.
7.
For E-8P
™
valve only:
While applying thumb pressure
to the primary piston (22), lift out and up on the three
lock tabs of the primary piston retainer (15).
8.
For E-10P
™
valve only:
While depressing spring seat
(7), remove retaining ring (8). Remove spring seat (7)
and coil spring (5).
Caution:
Before proceeding with the disassembly, refer
to Figures 3 and 4 and note that the lock nut (16) and
stem (17) are used to contain the primary piston return
spring (
for E-8P
™
valve:
23,
for E-10P
™
valve:
6), stem
spring (19), and the relay piston spring (21). The com-
bined force of these springs is approximately 50 pounds
and care must be taken when removing the lock nut as
the spring forces will be released. It is recommended
that the primary piston and relay piston be manually
or mechanically contained while the nut and stem are
being removed.
9. Using a 3/8” wrench, hold the lock nut (16) on the
threaded end of the stem (17). Insert a screwdriver to
restrain the stem, remove the lock nut (16), spring seat,
(18) and stem spring (19).
10.
For E-10P
™
valve only:
Remove adapter (1) and o-ring
(4). Remove the primary piston (2) from adapter (1) and
o-ring (34) from the primary piston (2).
