User manual BENDIX SR-5 TRAILER SPRING BRK VALVE

[. . . ] As piston travel continues, the control inlet valve opens. Air acting on the control piston also flows through passage A, unseating check valve B, and flowing past the open control inlet valve. This air flows into the spring brake cavities, releasing the spring brakes. CHARGING ABOVE 85 PSI (SEE FIGURE 4) Air pressure acting on the control piston and flowing through passage A also acts on pressure protection valve C. [. . . ] 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 6 8. Use only genuine Bendix ® replacement parts, components and kits. Replacement hardware, tubing, hose, fittings, etc. 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. control valve and the trailer air supply valve in the charge position. As system pressure reaches approximately 75-95 psi, the trailer spring brakes should also build up to approximately 75- 95 psi before the reservoir(s) begin to charge. When full system pressure is reached, and the spring brakes are fully released, apply a soap solution to the SR-5TM valve exhaust port and the vent. A 1" bubble in 5 seconds is permissible. Place the trailer air supply valve in the exhaust position. Disconnect the trailer supply line and apply a soap solution to check for leaks. A 1" bubble in 5 seconds is permissible. Reconnect the trailer supply hose coupling and recharge the trailer system. The tractor air system should bleed down to approximately 70 psi. The trailer spring brakes should remain released. After the system is stabilized, leakage at the open drain cock should not exceed a 1" bubble in 5 seconds. If the SR-5TM valve does not function as described; or if leakage is excessive, repair the valve, or replace with a genuine Bendix service replacement valve. PREVENTIVE MAINTENANCE Important: Review the Bendix Warranty Policy before performing any intrusive maintenance procedures. [. . . ] Install o-ring(5) in its groove in the pressure protection piston(4). Install the piston assembly into the valve body. Position the spring(3) and spring retainer(2) on top of the pressure protection piston assembly, and secure with the four screws(1). Install diaphragm(25), washer(24) and screw(23) into the exhaust port. [. . . ]