BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio descargar pdf (Pagina 31)

LOW AIR PRESSURE SWITCH

1. Set the parking brake.

2. Drain all air reservoirs. Refer to “Draining Air Reservoirs.”

3. Start the engine and run at a fast idle.

4. Verify that the low pressure tone alarm is on.

• If the tone alarm is not on when first charging the system, check the tone alarm

circuit or replace the low pressure switch as necessary. Refer to SECTION 8C to

check the tone alarm circuit and “Low Air Pressure Switch” to replace the low air

pressure switch.

5. The low-pressure tone alarm should turn off when the dual air pressure gauge

indicates 470-510 kpa (68-74 psi).

• If the tone alarm does not turn off, check the tone alarm circuit or replace the

low pressure switch as necessary. Refer to SECTION 8C to check the tone alarm

circuit and “Low Air Pressure Switch” to replace the low air pressure switch.

STOPLAMP SWITCH

For electrical diagnosis, refer to SECTION 8B and/or the Derivability, Emissions, and

Electrical Diagnosis Manual for these models.

1. Connect the trailer air lines to a known operating trailer.

2. Block the vehicle wheels.

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

4. Apply the system park control, the trailer air supply, and tractor park controls

if they are present.

5. Turn off the engine.

6. Open the drain cock and drain the rear service reservoir(s).

7. Check the following:

• The brake lamps should illuminate when either the foot brake or the trailer

brake hand control is applied.

• The trailer brake hand control and the foot brake should operate the trailer

service brakes when applied individually.

• If either of these does not work, replace the stoplightp switch. Refer to

“Stomplight Switch” in “On-Vehicle Service.”

Air Brake System

Revised 11/15/99

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio Pagina 31