TM-9-2330-342-23-P

PALLETIZED LOAD SYSTEM TRAILER (PLST) M1076 A1

TECHNICAL MANUAL; FIELD MANUAL

OCTOBER 2012

TM-9-2330-342-23-P - Page 378 of 1348

Table

1.

Service Brake Air Lines -

Continued.

Axle No. 1

Axle No. 2

Axle No. 3

Air Hose No.

Air Hose No.

Air Hose No.

The LH and RH listed with the air hose

numbers indicate the brake chamber supplied

by the listed air hose.

Figure 1.

Trailer Air System.

CONDITION/INDICATION

Are air lines and fittings free of crimps?

DECISION

Lines OK - Go to (Step 2 - Does brake relay valve exhaust air when brake pedal is released?).

Lines Crimped - Replace faulty air line(s) (WP

0067). Go to (Step 7 - Does service brake(s) release correctly?) to

verify problem is solved.

STEP 2

Does brake relay valve exhaust air when brake pedal is released?

NOTE

The relay valve test listed below applies to all brake relay valves.

1.

Have assistant turn engine start switch to ON. Refer to vehicle Operator's manual (WP

0190).

2.

Push in trailer charge valve in vehicle. Refer to vehicle Operator's manual (WP

0190).

3.

While assistant fully applies and releases brake pedal, listen for pressure to exhaust from relay chamber. Refer

to vehicle Operator's manual (WP

0190).

CONDITION/INDICATION

Does brake relay valve exhaust air when brake pedal is released?

DECISION

Air Exhausts - Go to (Step 3 - Do brake chamber rods retract when brake pedal is released?).

No Air - Replace relay valve (WP

0076). Go to (Step 7 - Does service brake(s) release correctly?) to verify problem

is solved.

TM 9-2330-342-23&P

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