PARKING BRAKES ON ALL AXLES DO NOT APPLY, OR APPLY SLOWLY.

TM 9-2330-385-14

4-16. BRAKE SYSTEM TROUBLESHOOTING PROCEDURES (CONT).

3. PARKING BRAKES ON ALL AXLES DO NOT APPLY, OR APPLY SLOWLY.

INITIAL SETUP

Tools and Special Tools

References

Tool Kit, General Mechanic's: Automotive

TM 9-2320-364-10

Equipment Condition

Engine OFF, (TM 9-2320-364-10)

Personnel Required

Parking brake applied, (TM 9-2320-364-10)

Two

Wheels chocked, (TM 9-2320-364-10)

Emergency air supply gladhand connected

START

TEST OPTIONS

KNOWN INFO

Visual inspection.

Are air lines 2254, 2620 and

Truck air system OK.

fittings free of crimps?

REASON FOR QUESTION

POSSIBLE PROBLEMS

If air lines 2254, 2620 and

Air lines and fittings faulty.

fittings are crimped, parking

Multifunction valve faulty.

brakes will not apply or apply

correctly. If multifunction valve

is faulty, air will not exhaust and

parking brakes will not apply or

apply correctly.

Repair or replace air

lines and fittings (see

schematic Fig FO-2 or

Verify repair, go to

Step 3 of this Fault.

YES

4-262