BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio descargar pdf (Pagina 28)

AIR LEAKAGE CHECK

1. Set the parking brake.

2. Start the engine and charge the air system to the governor cutout point.

3. Stop the engine.

4. Apply and release the service brakes.

5. Note air leakage.

• Vehicles without trailer controls-The dual air pressure gauge reading should drop

less than 28kPa (4 psi) in 2 minutes.

• Vehicles with trailer controls-The dual air pressure gauge reading should drop

less than 41 kpa (6 psi) in 2 minutes.

• If the dual air pressure gauge reading drops more than specified, check for

leaks at the air line connections, application valve, trailer hand, control valve,

relay valve, park brake control valve, governor, and other parts on the supply

side of the application valve. Refer to “System Schematics” for diagrams show-

ing the parts on the supply side of the application valve or SECTION 5H to test

air valves for leaks.

6. Start the engine and charge the system to the governor cutout point.

7. Stop the engine.

8. Firmly apply and hold the brakes.

9. Note air leakage.

• If the air pressure drops 10 percent or more, check the foundation brake adjust-

ment at each wheel or excessive lining and brake drum wear. Refer to SECTION

5I.

• Vehicles without trailer controls-The dual air pressure gauge reading should drop

less than 41 kpa (6 psi) in 2 minutes.

• Vehicles with trailer controls-The dual air pressure gauge reading should drop

less than 55 kpa (8 psi) in 2 minutes.

• If the dual air gauge reading drops more than specified, test for leaks at the air

line connections, double check valves, quick release valve, relay valve, and other

parts on the delivery side of the application valve.

10. Start the engine and charge the air system to the governor cutout point.

11. Stop the engine.

Air Brake System

Revised 11/15/99

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio Pagina 28