BENDIX E-7 DUAL BRAKE VALVE Manual - Página 4

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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 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

2. In most installations, the E-7

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

3. If necessary to remove the E-7

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

identified 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 firmly and remove upper static piston

assembly.

DISASSEMBLY (UPPER STATIC PISTON

ASSEMBLY)

1. Remove o-rings (2) and (3).

2. Remove retaining ring (17), and remove secondary circuit

inlet exhaust assembly (1).

DISASSEMBLY OF LOWER STATIC ASSEMBLY

1. Apply firm pressure on spring seat (19), which will

compress piston return spring. Locking groove in piston

is now accessible through rectangular opening in lower

static piston body. Insert wire or screwdriver into locking

groove, thus holding static piston spring in compressed

position.

™

valve.

™

internal parts may be

™

as described in disassembly.

™

from the engine

2. Insert blade of screwdriver through relay piston exhaust

passage into slot of stem, and remove lock nut (14),

being careful not to nick the exhaust seat of the relay

piston.

3. Remove spring seat (15), stem spring (23), spring seat

nut (16), rubber spring seat (19), and rubber spring, (10).

4. Relay piston, relay spring, (5) and stem bolt may now

be removed.

5. Removal of screwdriver or wire from locking groove will

permit spring load to push the primary circuit piston from

the lower static piston. Note: Care should be used when

removing tool from locking ring because of spring load.

6. Remove o-rings (6 & 7) from relay piston and o-ring, (9)

from primary circuit piston.

7. Remove o-rings (11 & 12) from lower static piston.

8. Remove large retaining ring (20) from lower static piston,

and remove primary circuit inlet/exhaust valve assembly

(4).

DISASSEMBLY-EXHAUST CHECK VALVE

Some E-7

™

brake valves have an air exhaust check valve

(13, 21 & 22) as shown on Figure 2. If so, remove screw

(21), and washer (22), and discard diaphragm (13). Replace

(21) and (22) using new diaphragm (13).

ASSEMBLY

Note: Before assembly, lubricate all o-rings, bores, and

mating surfaces with silicone lubricant, pc. no. 291126 (Dow

Corning 55-M). Do not lubricate rubber spring.

1. Install secondary circuit inlet-exhaust assembly (1) in

upper static piston, making certain retaining ring (17) is

engaged in groove of upper static piston bore.

2. Install o-rings (2 & 3) on upper static piston and install in

valve body.

3. Install primary circuit inlet-exhaust assembly in lower

static piston making certain retaining ring (20) is engaged

in groove of lower static piston bore.

4. Install three o-rings (2 of 11), and (12) in grooves of lower

static piston assembly. (Note: The larger diameter

o-ring is installed in groove nearest to bottom of piston

assembly.)

5. Install o-rings (6) and (7) on relay piston and o-ring (9)

on primary circuit piston.

6. Carefully clamp primary circuit piston in a soft-jawed

vise taking care not to damage the exhaust seat or the

outside diameter. Assemble the rubber spring, (10) over

the center stem of the center of the piston, then the

spring seat (19) and the spring seat nut (16). Tighten

the spring seat nut until the end of the piston stem and

the spring seat nut are flush.