TM 9-2330-356-14
Table 4-9. Unit Troubleshooting (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
BRAKE SYSTEM (Con't)
NO BRAKES OR WEAK BRAKES.
5.
Test for leaking air chamber diaphragm (para 4-37 or 4-38).
Step 1.
If air chamber is leaking, replace air chamber (para 4-37 or 4-38).
Inspect for grease on brake linings. Remove wheel and tire and hub and drum to expose wheel
Step 2.
brake (para 4-49). If grease is evident, inspect wheel seal for damage.
Inspect for worn brake linings.
Step 3.
If brake linings are worn within .030-inch of rivet heads, replace brake shoes (para 4-33 or
4-34).
Step 4.
If there is leakage or hesitation in brake application or release, replace relay emergency
6.
SLOW BRAKE APPLICATION OR SLOW RELEASE.
Test for leaking air chamber diaphragm (para 4-37 or 4-38).
Step 1.
if air chamber is leaking, replace air chamber (para 4-37 or 4-38).
Check for broken brake shoe tension spring. Remove wheel and tire and brake drum to expose
Step 2.
If brake shoe tension spring is broken, replace the spring (para 4-33 or 4-34).
Step 3.
If there is leakage or hesitation in brake application or release, replace relay emergency
7.
GRABBING BRAKES.
Check for improperly adjusted brakes (para 4-33 or 4-34). Check automatic adjusters.
Step 1.
Inspect for grease on brake linings. Remove wheel and tire and hub and drum (para 4-49) to
Step 2.
expose wheel brake. If grease is evident, inspect wheel Seal for damage.
Step 3.
Inspect for loose or worn wheel bearings.
If wheel bearings are loose, adjust to the proper preload (para 4-49). If they cannot be