User manual BENDIX AR-2 ANTILOCK RELAY VALVE

[. . . ] ® Bendix® AR-2TM AntiLock Relay Valve ANTILOCK CONTROLLER MOUNTING HOLES(4) MOUNTING BRACKET SERVICE SUPPLY CONTROL DELIVERY DELIVERY FIGURE 1 - AR-2TM ANTILOCK RELAY VALVE ASSEMBLY DESCRIPTION The AR-2 antilock relay is a specialized air brake valve developed for use on antilock equipped tractors only. It is essentially a BP-R1TM "bobtail" brake proportioning relay valve (Bendix Service Data Sheet SD-03-1067) with a modified cover that permits direct attachment of a Bendix® antilock controller such as the EC-15TM. When combined with an antilock controller the resulting assembly is referred to as a antilock controller relay assembly. For example when the AR-2TM valve is combined with the EC-15TM electronic controller, the resulting assembly is referred to as a CR-16TM controller relay assembly. [. . . ] Make a full brake application and note that both test gauges register the same pressure. IMPORTANT: If during testing the service port pressure is SLOWLY increased from approximately 70 psi to a full (100 psi or greater) brake application, the AR-2TM valve MAY begin to cycle between an apply and exhaust mode. This 7 OPERATION & LEAKAGE TESTS Operating Test To properly test the function of the AR-2TM valve, a pair of test gauges or gauges of known accuracy must be used. Install a "tee" at the AR-2TM valve's service port and at one of the delivery ports, then install a gauge in each. Connect the tractor service and emergency "glad hands" (hose couplings) to dummy connectors, or alternatively, to a trailer. Build the tractor system air pressure to governor cut-out and make 4 to 5 full brake applications. Check the air fittings at the AR-2TM valve for leakage. Tighten as needed. DASH CONTROL VALVES TRACTOR PROTECTION BRAKE VALVE M-21TM MODULATORS AR-2TM WITH CONTROLLER FIGURE 9 - TYPICAL CR-16TM AIR BRAKE SYSTEM condition is normal while the AR-2TM valve is transitioning from the proportioning mode to the full delivery mode and will only occur if the service application is SLOWLY increased as described. Cycling will not occur or can be stopped by increasing or decreasing service port pressure. Remove the test gauges from the AR-2TM valve. If the AR-2TM valve fails to perform as described it should be replaced or repaired using genuine Bendix replacement parts or kits. VALVE REMOVAL 1. Park the vehicle on a level surface and block the wheels and/or hold the vehicle by means other than the air brakes. Drain the air pressure from all vehicle reservoirs. Identify, mark or label all air lines and wiring cables and their respective connections on the valve or antilock controller to facilitate ease of installation. Remove the AR-2TM valve and controller assembly from the vehicle. LEAKAGE TESTS 1. Build the air system pressure to governor cut-out. With the dash mounted trailer supply valve activated for tractor/trailer operation, apply a soap solution to both exhaust ports (one in cover and one in body). The leakage noted should not exceed a 1" bubble in less than 3 seconds at either exhaust port. Make and hold a full brake application and apply a soap solution to both exhaust ports and around the cover where it joins the body. The leakage noted should not exceed a 1" bubble in less than 3 seconds at any exhaust port with no leakage detected between the cover and body. VALVE INSTALLATION 1. Install all air line fittings and plugs making certain thread sealing material does not enter the valve. Install the assembled valve on the vehicle. [. . . ] Insert the service piston (23) in the cover (4) so that the coils of the spring (24) are contained within the piston and the six protruding posts of the piston are visible after the piston is in the cover. Install the o-ring (22) on the exhaust piston (21) then install the exhaust piston (21) in the cover (4). Refer to the figure and make certain that the exhaust piston (21) is installed with its concave surface away from the service piston (23). While holding the exhaust piston (21) in the cover (4), install the retaining ring (20), making certain it is fully seated in its groove. [. . . ]