BENDIX R-12P PILOT RELAY VALVE Manual - Halaman 6

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5. Following the vehicle manufacturer's recommended

procedures, deactivate the electrical system in a

manner that safely removes all electrical power

from the vehicle.

6. Never exceed manufacturer's recommended

pressures.

7. Never connect or disconnect a hose or line

containing pressure; it may whip. Never remove

a component or plug unless you are certain all

system pressure has been depleted.

8. Use only genuine Bendix

components and kits. Replacement hardware,

tubing, hose, ﬁ ttings, etc. must be of equivalent

size, type and strength as original equipment and

be designed speciﬁ cally for such applications and

systems.

9. Components with stripped threads or damaged

parts should be replaced rather than repaired. Do

not attempt repairs requiring machining or welding

unless speciﬁ cally stated and approved by the

vehicle and component manufacturer.

10. Prior to returning the vehicle to service, make

certain all components and systems are restored

to their proper operating condition.

11. For vehicles with Antilock Traction Control (ATC),

the ATC function must be disabled (ATC indicator

lamp should be ON) prior to performing any vehicle

maintenance where one or more wheels on a drive

axle are lifted off the ground and moving.

PREVENTIVE MAINTENANCE

Important: Review the Bendix Warranty Policy before

performing any intrusive maintenance procedures. A

warranty may be voided if intrusive maintenance is

performed during the warranty period.

No two vehicles operate under identical conditions, as a

result, maintenance intervals may vary. Experience is a

valuable guide in determining the best maintenance interval

for air brake system components. At a minimum, the valve

should be inspected every 6 months or 1500 operating

hours, whichever comes ﬁ rst, for proper operation. Should

the valve not meet the elements of the operational tests

noted in this document, further investigation and service

of the valve may be required.

replacement parts,

SERVICE CHECKS

1. Remove any accumulated contaminants. Visually

inspect the valve's exterior for excessive corrosion

or physical damage. Repair/replace the valve as

necessary.

2. Inspect all air lines connected to the valve for signs

of wear or physical damage. Repair/replace as

necessary.

3. Test air line ﬁ ttings for excessive leakage and tighten

or replace as necessary.

OPERATIONAL AND LEAKAGE TESTS

1. Block the vehicle's wheels and fully charge the air

system.

2. Apply and release the service brakes several times

and check for prompt response of the brakes at all

appropriate wheels.

3. With the air system fully charged, apply a soap solution

™

to the R-12P

valve exhaust port. Leakage of a 1"

bubble in 5 seconds is permissible.

4. Make and hold a full brake application and again apply

a soap solution to the R-12P

of a 1" bubble in 3 seconds is permissible.

5. With the brakes still applied, apply a soap solution

around the valve where the cover meets the body. No

leakage at this point is permitted.

If the valve does not function as described; or if leakage is

excessive, repair the valve or replace it at any authorized

parts outlet.

NOTE: If a supply line single check valve is present (see

Figure 2), check it for leakage. Disconnect the inlet

side of the single check valve and coat the open

end with a soap solution. Make and hold a full

brake application. Leakage of a one inch bubble in

ﬁ ve seconds is permissible. If the valve's leakage

is excessive, replace it with a 1/2" single check

valve.

REMOVAL

1. Drain all system air pressure.

2. Identify and mark or label all air lines and their

connections to the R-12P

valve, if present. Then disconnect the air lines.

3. Remove the R-12P

™

valve exhaust. Leakage

™

valve and the single check

valve from the vehicle.