BENDIX BP-1 BRAKE PROPORTIONING VALVES Podręcznik - Strona 6

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REMOVAL OF BP-1

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VEHICLE

1. Secure the vehicle on a level surface by means other

than the brakes.

2. Drain the air system completely making sure all reservoirs

are at atmospheric pressure.

3. Remove and identify the air lines from the BP-1

valve. The BP-1

front valve is usually located along the

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frame rail between the brake valve and front axle.

4. Remove the two bolts attaching the BP-1

the vehicle and move the valve to a bench.

5. Clean the exterior of the valve taking care to prevent

contaminates from entering the open ports of the valve.

DISASSEMBLY OF BP-1

(REFER TO FIGURE 5)

1. Remove the four Sems screws from the cover.

Caution: Hold cover down against spring load and

release gently when screws are removed. Retain the

screws and the metal tag with 'BP-1 Front' stamped on

it. Separate the cover from the body. Remove and

discard o-ring(7).

2. Remove the upper piston from the cover and the piston

spring(4) and lower piston from the body.

3. With a pair of needle nose pliers grasp the end of the

valve spring(6) inside the lower piston and remove by

pulling and turning the spring in a clockwise manner.

4. Remove the inlet/exhaust valve(5) from the lower piston.

5. Remove the o-rings(1), (2), (3) from the pistons.

CLEAN & INSPECT

1. Wipe the interior of the body, cover and the pistons

with a clean dry cloth to remove any contaminates.

2. Visually inspect all components for cracks, scoring, or

damage of any kind. If any of these conditions exist,

the valve should be replaced.

FRONT VALVE FROM

front valve to

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FRONT VALVE

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ASSEMBLY (REFER TO FIGURE 5)

1. Coat bore surfaces of both the cover and the body with

a light film of silicone lubricant.

2. Lubricate the four o-rings in kit with the same material

as Step 1.

3. Install o-rings(1) and (2) on the lower piston, o-ring(3) on

the upper piston and o-ring(7) on the cover. Refer to Figure

front

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4. Install the large end of the upper piston into the bore of

the cover of the valve.

5. Place the inlet/exhaust valve(5) into the I.D. of the lower

piston and retain with valve spring(6). Use needle nose

pliers to install spring(6) by grasping spring on the bar

that intersects the end of the spring and twisting in a

clockwise motion while pressing down.

Caution: Be sure inlet/exhaust valve is seated flat against

the bottom of the piston and the spring is fully

seated below the step on the I.D. of the piston

wall. Refer to Figure 5.

6. Install the lower piston assembly into the body of the

valve. (Large end to enter the bore first.)

7. Install the piston spring into the body of the valve. (Large

diameter of the spring to enter first.)

8. Place the cover and upper piston onto the body so that

the supply port is directly above the control port. Place

the valve on a firm surface and compress the spring by

pushing down on the cover. Hold in this position and

install two of the four 1/4" Sems screws.

9. Place the metal tag stamped 'BP-1 Front' onto one of

the remaining 1/4" Sems screws. Install all Sems screws

and torque to 50-80 inch pounds.

10. Reinstall the BP-1

reconnect the air lines as identified in 'Removal'

instructions.

11. Refer to section titled 'Operational Checks'.

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front valve on the vehicle and