BENDIX TCH-003-036 User's Manual
Contents
1. Technical Bulletin Bulletin No PRO 03 36 Effective Date 2 1 93 Page 1 of 2 Subject Proper Use of Two Button Modular Dash Control Valves Two button modular dash control valves are designed so that the control valves operate in the following manner e When the yellow system park button is pulled out the trailer supply valve automatically trips and the red button pops out This operation applies the parking brakes of both the tractor and trailer and closes the control and supply lines to the trailer See Fig 1 e The red trailer air supply button may be subsequently pushed in This operation releases the trailer parking brakes and supplies air to operate trailer auxiliary devices See Fig 2 e Pushing in both the yellow and red buttons releases both the tractor and trailer parking brakes and opens the trailer control and supply lines See Fig 3 lt has come to our attention that some vehicle operators are using dash control valves improperly when parking combination vehicles overriding the automatic function of the system by holding the red button in when pulling the yellow button Bendix does not recommend parking combination vehicles in this manner since this parks the tractor but does not park the trailer Fig 4 DEPICTS THE IMPROPER USE OF THE DASH CONTROL VALVE There may however be situations where it is desirable to release the trailer parking brakes while the tractor remains pa2. rked by depressing the red button This procedure is generally used with the vehicle attended to enable the use of auxiliary devices on the trailer i e pump off Bendix has determined that if vehicles fitted with its MV 3 dash control valve are operated in a manner where the red button is not allowed to pop out automatically and the valve remains inoperative for extended periods under pressure this may impact its ability to function automatically during parking brake applications lt is recommended that when parking both yellow and red buttons should be in the outward position and whenever possible the engine should be off with the vehicle in gear and the front wheels turned toward the curb This procedure will ensure safe parking and proper operation of the dash control valves ul w MV 3 TOP VIEW Trailer Release with system Park Tractor Parked Improper Park Holding Trailer system Release Supply In While Parking Tractor
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