BENDIX AR-2 ANTILOCK RELAY VALVE Manual - Página 7

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2. Stop the engine and remove ignition key when

working under or around the vehicle.

working in the engine compartment, the engine

should be shut off and the ignition key should be

removed. Where circumstances require that the

engine be in operation, EXTREME CAUTION should

be used to prevent personal injury resulting from

contact with moving, rotating, leaking, heated or

electrically charged components.

3. Do not attempt to install, remove, disassemble or

assemble a component until you have read and

thoroughly understand the recommended

procedures. Use only the proper tools and observe

all precautions pertaining to use of those tools.

4. If the work is being performed on the vehicle's air

brake system, or any auxiliary pressurized air

systems, make certain to drain the air pressure

from all reservoirs before beginning ANY work on

the vehicle. If the vehicle is equipped with an

™

AD-IS

air dryer system or a dryer reservoir module,

be sure to drain the purge reservoir.

5. Following

the

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, fittings, etc. must be of equivalent

size, type and strength as original equipment and

be designed specifically 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 specifically 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.

OPERATION & LEAKAGE TESTS

Operating Test

To properly test the function of the AR-2

gauges or gauges of known accuracy must be used.

1. Install a "tee" at the AR-2

one of the delivery ports, then install a gauge in each.

2. Connect the tractor service and emergency "glad hands"

(hose couplings) to dummy connectors, or alternatively,

to a trailer. Build the tractor system air pressure to

governor cut-out and make 4 to 5 full brake applications.

Check the air fittings at the AR-2

Tighten as needed.

vehicle

manufacturer's

replacement parts,

™

valve, a pair of test

™

valve's service port and at

™

valve for leakage.

3. With the trailer supply valve (dash control w/red octagonal

When

button) and system park control (dash control w/yellow

diamond button) activated for tractor/trailer operation,

apply and release the brakes several times and check

for prompt application and release at each wheel. If

prompt reaction is noted at some, but not all wheels,

test the M-21

valve and the brake chamber for proper operation. If a

"sluggish" response is noted at all wheels, inspect for a

kinked or obstructed air line leading to or from the AR-2

valve. If a complete release of the brakes is noted at

some, but not all wheels, test the M-21

modulator between the AR-2

chamber for proper operation. If an incomplete release

is noted at all wheels, inspect for a kinked or obstructed

air line leading to or from the AR-2

4. Check the AR-2

10 psi to the service port and noting the pressure

registered at the delivery port. Subtract delivery port

pressure from the 10 psi service pressure to obtain the

differential. Compare the measured differential with the

pressure specified for the AR-2

NOTE: For AR-2

return spring the measured differential should be

approximately 4 psi. When a spring is in use, the

differential will be higher.

5. Make and hold a full (100 psi or greater) brake application

and note that full pressure is delivered to the brake

chambers.

6. Activate the dash mounted trailer supply valve for bobtail

tractor operation. Then make a slow brake application,

increasing the pressure at the AR-2

to 20 psi while watching the reaction at the delivery port

gauge. Note that delivery pressure rises to approximately

5 to 10 psi and remains constant while service pressure

continues to rise to 20 psi. Release the application.

7. Make another brake application and slowly increase

the pressure at the AR-2

60 and 70 psi while observing the gauge installed at the

delivery port. Note that when service port pressure rises

to between 20 and 30 psi, delivery pressure begins to

rise above the initial pressure noted in step 6. The rise

of delivery pressure should be at a proportioned rate of

approximately 3 to 1. For example: Each 3 psi increase

at the service port results in a delivery pressure increase

of 1 psi. At 70 psi service port pressure, brake chamber

pressure should be 15 to 25 psi.

8. Make a full brake application and note that both test

gauges register the same pressure. IMPORTANT: If

during testing the service port pressure is SLOWLY

increased from approximately 70 psi to a full (100 psi

or greater) brake application, the AR-2

to cycle between an apply and exhaust mode. This

™

antilock modulator between the AR-2

™

valve and the brake

™

valve.

™

valve's differential pressure by applying

™

valve part number.

™

valves not incorporating a relay piston

™

valve service port

™

valve service port to between

™

antilock

valve MAY begin