BENDIX E-12-E-15 BRAKE VALVE Manual - Page 5

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OPERATION & LEAKAGE CHECKS

GENERAL

A change in vehicle braking characteristics or a low pres-

sure warning may indicate a malfunction in one or the other

brake circuit, and although the vehicle air brake system

may continue to function, the vehicle should not be oper-

ated until the necessary repairs have been made and both

braking circuits, including the pneumatic and mechanical

devices are operating normally. If the brake valve does

not function as described above or leakage is excessive,

it is recommended that it be replaced with a new or remanu-

factured unit available at Bendix outlets. Always check the

vehicle brake system for proper operation after performing

brake work and before returning the vehicle to service.

OPERATING CHECK

Check the delivery pressure of both No. 1 and No. 2 circuits

using test gauges known to be accurate.

Note: The treadle or pedal will not be in a "normal" released

position until the air brake system is pressurized. The pedal

or treadle will rise to its normal release position as the brake

system is pressurized from 0 psi.

Depress the treadle to several positions between the fully

released and fully applied positions and check the delivered

pressure on the test gauges to see that it varies equally and

proportionately with the movement of the brake pedal.

After a full application is released, the reading on the test

gauges should fall off to zero promptly. It should be noted

that the No. 1 circuit delivery pressure will be about 4 psi

greater than the No. 2 circuit delivery pressure with both

supply reservoirs at the same pressure. This in normal for

this valve.

LEAKAGE CHECK

Make and hold a pressure application of 20 psi.

Coat the exhaust port and body of the brake valve with a

soap solution.

Leakage permitted is a 1" bubble in 3 seconds in both the

applied and released positions.

WARNING! PLEASE READ AND FOLLOW

THESE

INSTRUCTIONS

PERSONAL INJURY OR DEATH:

When working on or around a vehicle, the following

general precautions should be observed at all times.

1. Park the vehicle on a level surface, apply the

parking brakes, and always block the wheels.

Always wear safety glasses.

2. Stop the engine and remove ignition key when

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

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

5. Following

6. Never exceed manufacturer's recommended

7. Never connect or disconnect a hose or line

8. Use only genuine Bendix

9. Components with stripped threads or damaged

10. Prior to returning the vehicle to service, make cer-

VEHICLE PREPARATION

1. Park the vehicle on a level surface and block the wheels

2. Drain the air pressure from all vehicle reservoirs.

AVOID

VALVE REMOVAL

1. Identify and mark or label all air lines and their respec-

2. Mark the relationship of the valve body to the mounting

working under or around the vehicle. When

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.

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.

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.

the

vehicle

recommended procedures, deactivate the electrical

system in a manner that safely removes all

electrical power from the vehicle.

pressures.

containing pressure; it may whip. Never remove a

component or plug unless you are certain all

system pressure has been depleted.

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.

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.

tain all components and systems are restored to

their proper operating condition.

and/or hold the vehicle by means other than the air

brakes.

tive connections on the brake valve to facilitate ease of

installation. Disconnect all air lines.

plate then remove the valve from its mounting on the

vehicle.

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manufacturer's

replacement parts,