User manual BENDIX DUAL RELAY VALVE

[. . . ] Each service reservoir is isolated and is protected from loss of air in other service reservoirs. The front and mid-axle service reservoirs supply air directly to the secondary and primary circuits of the foot brake valve, as well as antilock and traction components for their respective circuits. The rear axle service reservoir supplies air to the Dual Relay Valve, as well as the rear axle service antilock relay and traction components. SD-03-1000 1 PP-DCTM PUSH-PULL VALVE WITH INTEGRAL DOUBLE CHECK TO ACCESSORIES BVA-85TM DOOR INTERLOCK VALVE WITH CONTROL MODULE DUAL RELAY VALVE AD-IS EP EXTENDED PURGE AIR DRYER BA-922 ® TWIN CYLINDER COMPRESSOR Secondary Control REAR Primary Control FAM FRONT AXLE MODULE ABS-6 WITH TRACTION CONTROL RAM REAR AXLE MODULE FRONT MID FIGURE 2 - TYPICAL ARTICULATED COACH SCHEMATIC System Normal With the system normal and air pressure available in all service reservoirs, brake application pressure is transmitted from the primary and secondary circuits of the foot brake valve. Application pressure is transmitted simultaneously to the front and mid-axle brakes and to the primary and secondary control ports of the Dual Relay Valve. [. . . ] Perform the tests and inspections presented at the prescribed intervals. If the Dual Relay Valve fails to function as described or leakage is excessive, it must be replaced with a genuine Bendix unit, available at any authorized parts outlet. Remove any accumulated contaminants and visually inspect the exterior for excessive corrosion and physical damage. 2. Inspect all air lines connected to the Dual Relay Valve for signs of wear or physical damage. Test air line fittings for excessive leakage and tighten or replace as necessary. Perform the Operation and Leakage Tests described in this manual. 8. must be of equivalent size, type and strength as original equipment and be designed specifically for such applications and systems. Components with stripped threads or damaged parts should be replaced rather than repaired. Do not attempt repairs requiring machining or welding unless specifically stated and approved by the vehicle and component manufacturer. Prior to returning the vehicle to service, make certain all components and systems are restored to their proper operating condition. For vehicles with Antilock Traction Control (ATC), the ATC function must be disabled (ATC indicator lamp should be ON) prior to performing any vehicle maintenance where one or more wheels on a drive axle are lifted off the ground and moving. GENERAL SAFETY GUIDELINES WARNING!PLEASE READ AND FOLLOW THESE INSTRUCTIONS TO AVOID PERSONAL INJURY OR DEATH: When working on or around a vehicle, the following general precautions should be observed at all times. 1. Park the vehicle on a level surface, apply the parking brakes, and always block the wheels. Stop the engine and remove ignition key when working under or around the vehicle. When working in the engine compartment, the engine should be shut off and the ignition key should be removed. Where circumstances require that the engine be in operation, EXTREME CAUTION should be used to prevent personal injury resulting from contact with moving, rotating, leaking, heated or electrically charged components. Do not attempt to install, remove, disassemble or assemble a component until you have read and thoroughly understand the recommended procedures. Use only the proper tools and observe all precautions pertaining to use of those tools. If the work is being performed on the vehicle's air brake system, or any auxiliary pressurized air systems, make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle. If the vehicle is equipped with an AD-IS® air dryer system or a dryer reservoir module, be sure to drain the purge reservoir. [. . . ] Primary Control (41) 20 psi 40 psi 60 psi 100 psi Delivery port (22) 20 psi 40 psi 60 psi 100 psi 9. Make certain all lines and fittings are returned to their original pretest positions and tightened sufficiently to prevent leakage. Make and hold a full brake application and test all lines and fittings for leakage and note that the Dual Relay Valve is operating correctly. If the valve does not function as described or if leakage is excessive, replace the Dual Relay Valve with a genuine Bendix replacement. 5. [. . . ]