Table 9-1. Compressed Air and Brake System Troubleshooting Procedures (Continued).
TEST OR INSPECTION .
CORRECTIVE ACTION .
16. PRESSURE GAGE(S) NOT INDICATING OR IS NOT ACCURATE, BRAKES NORMAL:
Disconnect affected air line(s) at gage(s) and press the brake pedal. If no air exhausts,
the line is clogged or broken.
Replace defective line or gage (para 9-20).
17. AIR HORN DOES NOT OPERATE:
Check for air LOW PRESSURE.
If air pressure is below 20 Ibs , operate engine until air pressure is back to 120 Ibs.
See Malfunction 1.
Inspect air lines for damage or clogging.
Replace damaged or clogged lines.
Replace defective manually-operated horn valve (para 9-45).
18. WINDSHIELD WIPERS OR WASHERS ARE INOPERATIVE:
Check for air leakage in lines to the wiper or washer control valve using a soap solution.
Tighten loose connections and replace damaged lines.
Check to see if the wiper mechanical linkage is binding or broken.
Replace defective linkage (para 9-42).
Loosen air line at the wiper motor and turn control to the run position. Air should
exhaust from the line.
If no air exhausts, replace the control valve (para 9-43).
If air exhausts, replace the motor (para 9-42).