KNOWN INFO                  REASON FOR QUESTION                TEST OPTIONS            Do FRONT BRAKE/REAR BRAKE AIR pressure gages show even pressure? 1. NO YES Visual Inspection Low pressure on both FRONT BRAKE/REAR BRAKE AIR pressure gages indicates air system cannot maintain operating pressure. INITIAL SETUP   Equipment Conditions      Engine running (TM 9-2320-365-10).      Parking brake on (TM 9-2320-365-10).      Wheels chocked (TM 9-2320-365-10).   Materials/Parts       Soap, Laundry (Item 69, Appendix D). START j1. AIR SYSTEM LOSES PRESSURE DURING OPERATION/SLOW, NO, OR INCORRECT AIR       PRESSURE BUILDUP             KNOWN INFO              Nothing. Perform Brake Troubleshooting i2. Rear Brakes Do Not Apply or i6. Front Brakes Do Not Apply. TM 9-2320-365-20-2 2-1714          Change 1 Tools and Special Tools   Tool Kit, Genl Mech (Item 44, Appendix C)   Goggles, Industrial (Item 15, Appendix C)   Pan, Wash (Item 25, Appendix C) Faulty FRONT BRAKE/REAR BRAKE AIR pressure gages. Damaged air hose from air cleaner to air compressor. Damaged air hose from air compressor to air dryer. Damaged air hose from air dryer to wet tank. Damaged air hose from wet tank to air compressor. Damaged air hoses from wet tank to primary and secondary air tanks. Faulty check valves at primary and secondary air tanks. Faulty air dryer purge valve and/or clogged desiccant cartridge. Faulty air compressor governor. Faulty air compressor.