TM 9-2320-272-24-1
Table 2-4. Compressed Air and Brake System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Test 9. Test doublecheck valve No. 1(2) supply pressure (front service brake chambers test low or
nonexistent air pressure).
WARNING
Do not depress service brake pedal during installation of test
gauge. This may result in injury to personnel.
Step 1.
Direct assistant to keep foot off service brake pedal (6).
Step 2.
Disconnect air supply line (1) from doublecheck valve No. 1 (2).
Step 3.
Connect test gauge to air supply line (1). Direct assistant to start engine and allow air
pressure to build to normal operating pressure.
Step 4.
Depress service brake pedal (6).
Step 5.
Check reading on test gauge.
a. If pressure reads normal and delivery line (3) is not blocked (as determined by
test 8), replace defective doublecheck valve No. 1 (2) (para. 3-212).
b. If pressure is below normal or nonexistent, stop engine, drain air, remove test gauge,
connect delivery line (3), and perform test 10.
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