BENDIX 03-B-04C User's Manual
Contents
1. The relay valve is primarily used on long wheel base vehicles to apply and release rear axle s service or parking brakes It is an air operated graduating directional control valve of high capacity and fast response Upon receipt of signal pressure from the service brake valve the relay valve will graduate hold and release air pressure from the brake chambers to which it is connected The relay valve is used to balance the time of brake applica tions on heavy duty vehicles They are especially needed where large volumes of air are required or long service lines cause the capacity of the brake valve to be exceeded Relay valves can be remote or reservoir mounted and dif fer primarily in the design The R 12 is piston operated and is offered with either ver tical delivery ports which are primarily used on trailers or horizontal delivery ports which are primarily used on truck tractors For service maintenance information see Service Data Sheet SD 03 31 MAINTENANCE KIT IS PC NO 102802 WEIGHT 2 25 LBS VMRS NO IS 13 010 009 DEVICE CODE IS 1064 DIFFERENTIAL SPRING Maintenance Kit 102802 consists of BERSE TE a fong SSC S a niet amp Exhaust Vv ia cay Retaining Ring Exh Cover Complete R 12 Vertical Service Replacement c NO el 102626 103912 7 104561 065104 A Delivery Port Size P T CATALOG _03 B 04C R 12 VERTICAL Mounting Brackets2. 1 4 P T CONTROL 2 06 2 56 iar a7 a7 PC NO 294314 A P T 1 2 P T SUPPLY PC NO DELIVERY 296010 4 UNIVERSAL A DELIVERY PORTS 4 Bottom View MOUNTING CONTROL 1 2 P T SUPPLY Differential Spring Pc No Mounting Bracket Pc No i aaa 296010 297991 meno Reducer bushings may be required to facilitate changeover See page 07 A 4 for piece numbers CRACK PRESSURE IS THE AMOUNT OF CONTROL PRESSURE REQUIRED BY THE VALVE TO INITIATE AIR DELIVERY 5 1987 Printed in U S A CATALOG 1 4 P T CONTROL 1 2 P T 2 DELIVERY 2 03 B 04D R12 HORIZONTAL The relay valve is primarily used on long wheel base vehicles to apply and release rear axle s service or parking brakes It is an air operated graduating directional control valve of high capacity and fast response Upon receipt of signal pressure from the service brake valve the relay valve will graduate hold and release air pressure from the brake chambers to which it is connected The relay valve is used to balance the time of brake applica tions on heavy duty vehicles They are especially needed where large volumes of air are required or long service lines cause the capacity of the brake valve to be exceeded Relay valves can be remote or reservoir mounted and dif fer primarily in the design The R 12 is piston operated and is offered with either ver tical deliv
3. ery ports which are primarily used on trailers or horizontal delivery ports which are primarily used on 2 06 truck tractors 2 56 For service maintenance information see Service Data Sheet SD 03 31 MAINTENANCE KIT IS PC NO 102802 WEIGHT 2 25 LBS Mounting Brackets VMRS NO IS 13 010 009 3 7 DEVICE CODE IS 1064 R 12 Horizontal c NO 103009 Service Crack A Mounting Differential Replacement Pressure Supply Port Bracket Spring Pc N P S I Size P T Piece No Pc No Eea PC NO 294314 a Maintenance Kit 102802 consists of UNIVERSAL Se oy a 1 4 P T etet a i o o CONTROL ej n oms Ca 1 Valve Retainer 1 inlet amp Exhaust Vae 7 ie 1 2 P T DELIVERY 3 DIFFERENTIAL c 8a lt a SPRING z200 oo 296010 297991 296010 296340 Reducer bushings may be required to facilitate changeover See page 07 A 4 for piece numbers CRACK PRESSURE IS THE AMOUNT OF CONTROL PRESSURE REQUIRED BY THE VALVE TO INITIATE AIR DELIVERY
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