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11. Remove the relay piston (20), relay piston spring (21),
primary piston (E-8P: 22, E-10P: 2) and primary piston
return spring (E-8P: 23, E-10P: 6) from the upper body.
Use care so as not to nick seats.
12. A small washer (24) will be found in the cavity of the
lower side of the primary piston (for E-8P: 22, for E-
10P: 2).
13. For E-8P only: Disassemble the primary piston by ro-
tating the spring seat nut (25) counterclockwise.
Separate the spring seat nut, spring seat (26), and rub-
ber spring (27) and remove the piston o-ring (28).
14. Remove the large and small o-rings (30 & 31) from the
relay piston (20).
15. Remove the retaining ring (32) securing the primary inlet
and exhaust valve assembly (33) in the upper body and
remove the valve assembly.
CLEANING AND INSPECTION
1. Wash all metal parts in mineral spirits and dry.
2. Inspect all parts for excessive wear or deterioration.
3. Inspect the valve seats for nicks or burrs.
4. Check the springs for cracks or corrosion.
5. Replace all rubber parts and any part not found to be
serviceable during inspection, use only genuine Bendix
replacement parts.
ASSEMBLY
Prior to reassembling, lubricate all o-rings, o-ring grooves,
piston bores, and metal to metal moving surfaces with Dow
Corning 55 o-ring lubricant (Bendix piece number 291126).
Note: All torques specified in this manual are assembly
torques and can be expected to fall off, after assembly is
accomplished. Do not retorque after initial assembly
torques fall.
1. Install the primary inlet and exhaust assembly (33) in
the upper body and replace the retaining ring (32) to
secure it. Be sure the retaining ring is seated completely
in its groove.
2. Install the large and small o-rings (30 & 31) on the relay
piston (20).
3. For E-8P only: Install o-ring (28) in the primary piston
(22) o-ring groove.
4. For E-8P only: Install the rubber spring (do not lubri-
cate) (27), concave side down in the primary piston (22)
and place the spring seat (26), flat side up, over the
rubber spring.
5. For E-8P only: Install the primary piston spring seat nut
(25), with its hex closest to the spring seat, and rotate
clockwise until the top surface of the spring seat is even
with the top surface of the piston. Set aside.
6. Place relay piston spring (21) in concave portion of relay
piston (20) and install relay piston through primary inlet/
exhaust assembly (33) into under side of upper body.
7. For E-10P only: Install o-ring (4) on adapter (1) and
install adapter on upper body. Install o-ring (34) on pri-
mary piston (2).
8. Place screwdriver, blade up, in vise. Insert stem (17)
through the relay piston upper body sub assembly, slide
this assembly over the blade of the secured screwdriver,
engage the screwdriver blade in the slot in the head of
the stem.
9. Place the washer (24) over the stem (17) and on top of
the relay piston (20).
10. Install primary return spring (E-8P: 23, E-10P: 6) in up-
per body piston bore.
11. For E-8P only: Install the primary piston rubber spring
sub assembly (steps 4 & 5) over the stem, into the up-
per body piston bore. For E-10P: Install primary piston
sub-assembly (reference step 7).
12. Compress piston(s) (For E-8P: the relay piston (20), for
E-10P: the primary and relay pistons (2 & 20)) and re-
taining ring into the upper body from either side and hold
compressed, either manually or mechanically. See the
cautionary note under step 8 in the Disassembly
section of this manual.
13. Place the stem spring (19) (E-8P: place over the spring
seat nut (25)), the spring seat (18) (concave side up)
and lock nut (16) on the stem (17). Torque to 20 - 30
inch pounds.
14. For E-8P only: Install the primary piston retainer (15)
over the piston, making certain all three lock tabs have
engaged the outer lip of the body.
15. For E-10P only: Install coil spring (5), spring seat (7),
and retaining ring (8) .
16. Replace the rubber seal ring (14) on the lower body.
17. Install the 4 hex head cap screws securing the lower
body to the upper body. Torque to 30 - 60 inch pounds.
18. Install the secondary inlet and exhaust valve assembly
(13) on the lower body.
19. Install the screws that secure the exhaust cover (12) to
the lower body. Torque to 20 - 40 inch pounds.
20. Secure the screw (9) holding the exhaust diaphragm
(10) and the diaphragm washer (11) to the exhaust cover
(12). Torque to 5 - 10 inch pounds.
21. Install all air line fittings and plugs making certain thread
sealant material does not enter valve.
VALVE INSTALLATION
1. Install the assembled brake valve on the vehicle.
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