GAGES AND INDICATORS (NON-ELECTRICAL) TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
TEST OR INSPECTION
AIR PRESSURE GAGES FAIL TO OPERATE. Vehicle must be articulated left to view air pressure gages.
Check air lines with a pressure gage of known accuracy (Figure 16-2).
If the system is pressurized--replace defective air pressure gage. Refer to paragraph 16-5.