TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 3. Check air pressure at brake pedal valve supply port (5).
Step 1. Stop engine and open all drainvalves (1), in sequence shown, until brake system air
pressure is vented.
Step 2. Close drainvalves (1).
Step 3. Disconnect secondary pressure gauge air line (6) from pedal valve supply port (5).
Step 4. Connect test gauge to supply port (5) of pedal valve (4).
Step 5. Direct assistant to start engine and allow air system to build to normal operating
pressure.
Step 6. Check test gauge reading.
a. If test gauge reads normal operating pressure, repair or replace clogged air line (6) to
secondary air pressure gauge (3) on instrument panel.
b. If test gauge reads no pressure, low pressure, or pressure is building slowly, perform
test 4.
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