TM 9-2330-390-14&P1-18. BRAKE SYSTEM (Con’t).KeyComponent4Pivoting Tray GladhandsDescriptionProvide quick disconnect air connections between front and reardollies and second dolly set when towed in tandem.5Intradolly Airbrake HosesRoute service and emergency air from front dolly to rear dolly.6Shutoff ValvesOpen to supply air to second dolly set when tandem towing.(With Levers)Close when tandem towing is complete.7Booster Relay ValvesProvide service brake air pressure to allow proper brake operation.8Relay ValveCloses service line from towing vehicle when parking brake lever onrear dolly has vented air from supply line to apply parking brakes.Prevents rear dolly service brakes from being applied at same timeas parking brakes. Also prevents towing vehicle brakes from lockingup.9Air ReservoirsStore compressed air to operate brakes. Each reservoir has amanually operated draincock which allows release of compressedair and drainage of condensation and other contaminants fromairbrake system.10Parking Brake Lever11Airbrake Control KnobApplies and releases parking brakes on rear dolly.Applies or releases front and rear dolly service brakes when dollyset is uncoupled from towing vehicle.12Full Function ValveWith emergency line and air reservoir pressurized, senses servicebrake pressure from towing vehicle and applies or releases air toservice airbrake chambers to apply or release brakes. In addition,controls spring brakes.1-19. STEERING SYSTEM.a.The steering system provides ground mobility when positioning front and rear dollies for attachment to ashelter. Once attached, the steering system provides similar mobility while the dolly set trailer is towed.b.Major components of the steering system include the following:1-35
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