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TM
5-2420-224-20-1
Table 3-5. Troubleshooting (Cont)
Malfunction
Test or Inspection
Corrective Action
BRAKES AND AIR SYSTEM (CONT)
Step 9. Disconnect hook switch leads (11) from front disc brake pad indicator wiring
harness (12) at both front brake assemblies (13) and check if brake indicator
light is lit.
If brake indicator light is lit, replace front disc brake pad
indicator wiring harness (page 4-231).
If brake indicator light is not lit, go to step 10.
Step 10. With hook switch leads (11) disconnected, check continuity between hook
switch leads and ground.
Replace hook switch that shows short to ground.
88. TRAILER BRAKE SYSTEM FAILS OR BRAKING WEAK.
NOTE
Brake lever must be fully actuated and dual brake gage indicating normal pressure.
Step 1. Check for leaking and damaged brake hose couplings.
If brake hose couplings are leaking or damaged, tighten or
replace couplings (page 4-324).
If brake hose couplings are not leaking or damaged, go to
step 2.
Step 2. Check for air leaks around trailer air supply valve.
If there are air leaks around trailer air supply valve, replace
trailer air supply valve (page 4-331).
If there are no air leaks around trailer air supply valve, go to
step 3.
Step 3. Check for air leaks around trailer hand brake valve.
If there are air leaks around trailer hand brake valve, replace
trailer hand brake valve (page 4-326).
If there are no air leaks around trailer hand brake valve, notify
direct support maintenance.
3-275

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