BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio descargar pdf (Pagina 29)

12. On vehicles with trailer controls, move the trailer brake hand control handle clock-

wise to the full “ON” position.

13. Air leakage should be less than 41 kpa (6 psi) in 2 minutes.

• If air leakage is more than 41 kpa (6 psi) check the airlines, trailer brake hand

control valve, tractor protection valve, and any valves on the trailer. Refer to

“System Schematics” for diagrams showing the parts between the tractor and

the trailer or SECTION 5H to test air valves for leaks.

MANUAL DRAIN COCK

The drain cock should be checked periodically for leakage. No leakage is allowed.

Replace the drain cock if necessary.

1. Set the parking brake.

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

3. Apply a soap solution to cover the drain cock (5).

4. If bubbles appear indicating air leaks, replace the drain cock (5).

BRAKE SYSTEM TESTING

A vehicle that pulls to one side during braking may need the front end aligned. Do not

automatically assume that this is a brake related condition. Make sure the alignment is

correct first.

Brakes should be tested on a dry, clean, reasonably smooth, and level roadway. A true

test of brake performance cannot be made if the roadway is wet, greasy, or covered

with loose dirt. These conditions prevent the tires from gripping the road equally. A

crowned roadway also affects brake testing by throwing the weight of the vehicle

toward the wheels on one side. Roadway rough enough to cause the wheels to

bounce also affects this test.

Test the brakes at different vehicle speeds with light and heavy pressure. Avoid locking

the wheels and sliding the tires on the roadway. Locked wheels and sliding rolling

wheels will stop the vehicle in less distance than locked wheels. More tire-to-road fric-

tion is present with a heavily braked rolling tire than a sliding tire.

For additional air brake system diagnosis, Refer to Figure 3.

INSERT FIGURE 3/AIR BRAKE SYSTEM DIAGNOSIS CHART

Air Brake System

Revised 11/15/99

1 2 ... 24 25 26 27 28 29 30 31 32

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BENDIX M-21-M-22 ANTILOCK MOD ASSY Manual de servicio Pagina 29