TM 9-2330-238-14
Table 3-1. Operator/Crew
Troubleshooting
(Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE
ACTION
6.
BRAKES DO NOT RELEASE.
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Check to see if relay valve is in applied
position.
If semitrailer
is coupled,
wait until air pressure on towing vehicle reaches normal operating
pressure.
If semitrailer
is uncoupled,
open air reservoir draincock,
Check to see if air reservoir draincock
is open.
Close air reservoir draincock.
Check intervehicular
air lines for loose connections.
Connect
intetvehicular
air lines properly
(para 2-10).
Check to see if shut-off valves on towing vehicle
are closed.
Open shut-off valves on towing vehicle.
Check intervehicular
air lines for restrictions.
Straighten
or remove any kinks, bends, or restrictions
from intervehicular
air lines.
7.
BRAKES GRAB.
Check air system for moisture.
Open air reservoir draincock
and drain moisture from system.
8.
BRAKES ARE SLOW TO ENGAGE
OR RELEASE.
Check master cylinder for proper level of brake fluid.
Fill master cylinder with brake fluid to proper level (Chapter 3, Section I).
WHEELS AND TIRES
9.
EXCESSIVELY
WORN,
SCUFFED,
OR CUPPED TIRES.
Step 1.
Check tires for proper inflation.
inflate tires to proper pressure
(para 1-10).
Step 2.
Inspect wheels for looseness.
Tighten wheel stud nuts.
Step 3.
Check tires to ensure that they are properly
matched.
Replace
unmatched
tire with one that matches.
3-10
