BENDIX E-14 DUAL BRAKE VALVE Manual - Página 6

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CAUTION: The brake valve may be light clamped in a bench

vise, but overclamping may damage the valve and

cause leakage and/or malfunction. If a vise is used,

clamp on the supply and delivery ports on opposing

sides of the valve's primary body.

1. Remove all air line fittings and plugs.

2. On valves that have a manifold on the engine

compartment side, remove the bolts that secure the

manifold to the valve. Separate the valve and manifold

and remove the sealing rings and adapter sleeves. (See

Figure 2.)

3. Remove the four cap screws(16) that secure the primary

body to the secondary body. Separate the two body

halves and remove and discard o-ring(17).

4. Pull secondary piston(18) out of the primary body and

remove and discard o-rings(19 & 20).

5. Remove and discard snap ring(10) from the secondary

body while manually holding and compressing valve

seat(11) in place.

6. Slowly release valve seat(11), allowing it to rise out of

the body. Remove the valve seat, then remove and discard

o-ring(12).

7. Remove and discard valve assembly(13) along with its

o-ring(15) from the secondary body. Remove the valve

assembly return spring(14).

8. Carefully remove and discard exhaust diaphragm

screw(24), diaphragm washer(25), diaphragm(26), and

diaphragm retainer(27) from the secondary body. NOTE:

Some E-14

™

brake valves have a threaded exhaust port

instead of items 24-27.

9. Using light force, push piston(2) into the primary body

until piston retaining ring(1) is fully visible. Remove piston

retaining ring(1), taking care not to damage the piston

bore in the body.

10. Gently tap the primary body on a soft surface to remove

piston(2). Remove and discard o-rings(3 & 5) and both

wear rings(4) from piston(2).

11. Place the piston on a flat surface. Using finger force,

depress and hold spring retainer(7), then remove and

discard retaining ring(6) from piston(2).

12. Gently release spring retainer(7), allowing it to rise out

of the piston. Remove spring retainer(7) and graduating

spring(8) from piston(2).

13. Remove and discard rubber spring(9) from the interior of

piston(2).

14. Remove and discard snap ring(10) from piston(2) while

manually holding and compressing valve seat(11) in

place.

15. Slowly release valve seat(11), allowing it to rise out of

piston(2). Remove valve seat(11), then remove and discard

o-ring(12).

16. Remove and discard valve assembly(13) along with its

o-ring(15) from piston(2). Remove valve assembly return

spring(14).

CLEANING & INSPECTION

1. Using mineral spirits or an equivalent solvent, clean and

thoroughly dry all metal parts.

2. Inspect the interior and exterior of all metal parts that

will be reused for severe corrosion, pitting, or cracks.

Superficial corrosion and/or pitting on the exterior portion

of the secondary and primary bodies is acceptable.

3. Inspect the bores of both bodies for deep scuffing or

gouges.

4. If primary piston(2) is reused, make certain that vents

"A & B" are open and free of obstructions. (See Figure

2.)

5. Make certain vent "C" is open in the primary body of the

valve. (See Figure 2.)

6. Inspect the pipe threads in both bodies. Make certain

they are clean and free of thread sealant.

7. Inspect pedal assembly and mounting plate. Make certain

the pedal roller turns freely and is lightly lubricated.

Note: Some pedal assemblies, not furnished by Bendix,

do not employ a roller. In this case, make certain the

mechanism in use moves across the plunger smoothly,

without binding or sticking. Inspect plunger for excessive

scuffing or wear. Check the plunger bore in the mounting

plate for excessive wear, shown by "egg shaping" (bell

mouthing). Inspect mounting plate for severe corrosion,

paying particular attention to the area around the pivot

pin bores.

8. If the brake valve uses a rubber boot between the plunger

and mounting plate, inspect the boot for deterioration

or cracking.

9. Inspect all air line fittings and plugs for corrosion Clean

all old thread sealant from the pipe threads.

Any valve or pedal assembly component that does not meet

the inspection criteria listed above should be discarded and

replaced before proceeding.

ASSEMBLY (SEE FIGURE 9)

1. Using silicone lubricant (650-M), lightly coat all o-rings,

o-ring bores, and grooves, except for the secondary

piston o-rings(19 and 20). Lightly lubricate primary

piston(2) bore into which graduating spring(8) is installed.

With the 328-M lubricant, lightly coat o-rings (19 and

20) and o-ring grooves on secondary piston(18).