AIR BRAKE RATING SYSTEM EFFECTIVE WITH THE 1983 MODEL YEAR GM AIR BRAKE EOUIPED VEHICLES HAVE COMPUTER SELECTED BRAKES AND BRAKE CHAMBERS BASED UPON THE SUSPENSION AND THE GAWR GROSS AXLE WEIGHT RATING FOR THE VEHICLE BRAKE AND CHAMBER PROCESSING CODES ARE ASSIGNED TO EACH VEHICLE WHEN THE INDIVIDUAL COMPONENT SPECIFICATIONS HAVE BEEN ESTABLISHED THE BRAKE ASSEMBLY PART NUMBERS HAVE BEEN IDENTIFIED IN TEXT GROUP 4 003 ACCORDING TO SUSPENSION CAPACITY SPECIFICATIONS AND AXLE TYPE THE BRAKE ASSEMBLY PART NUMBERS ARE ALSO FOUND ON THE VEHICLE BROADCAST SHEETS SUPPLEMENTAL BROADCAST SHEETS AND THE MAJOR COMPONENT PART NUMBER LABEL LOCATED ON THE PASSENGER S SUN VISOR INSTRUCTIONS FOR ORDERING PARTS 1 ALWAYS SHOW CORRECT PART NUMBER AND NAME OF PART 2 ALWAYS SHOW STREET ADDRESS AND FULL INSTRUCTIONS FOR SHIPMENT 3 DO NOT DESIGNATE QUANTITY BY SETS STATE SPECIFICALLY HOW MANY PARTS ARE WANTED 4 SPECIFY WHEN NECESSARY WHETHER PARTS ARE RIGHT OR LEFT HANDED PAINTED OR UNPAINTED FRONT OR REAR LEFT AND RIGHT ARE DETERMINED BY FACING THE SAME DIRECTION AS THE DRIVER ANY PART WHICH IS DESIGNATED FRONT IS ALWAYS NEAREST THE FRONT OF THE VEHICLE 5 CUSTOMER CODE 6 CONTROL OR PURCHASE ORDER 7 TYPE OF ORDER CIO VIP PAD ETC AR AS REQUIRED PARTS A SPECIAL CODE SYMBOL A POUND SIGN APPEARS IN THIS BOOK WHEN IT APPEARS FOLLOWING A PART NUMBER IT MEANS THAT IN THE PARTS DISTRIBUION SYSTEM THE PART WAS AR OR AS REOUIRED AT THE TIME THE BOOK WAS WRITTEN CLASSIFICATION OF SUCH PARTS DOES CHANGE SO CHECK YOUR PRICE BOOK BEFORE ORDERING BY DEFINITION AN AR PART IS A SERVICEABLE PART FOR WHICH THERE IS EXTREMELY LIMITED OR OUESTIONABLE DEMAND IT IS NOT STOCKED FOR SERVICE UNTIL DEMAND WARRANTS BUT CAN NORMALLY BE SUPPLIED IF PROPER ORDERING PROCEDURES ARE FOLLOWED HOW TO ORDER AR PARTS 1 ORDER INDIVIDUALLY AND SEPARATELY FROM STOCK PARTS ORDERS 2 IF USING AN AUTOMATED SYSTEM THEN ENTER YOUR ORDER OFF LINE VIA PHONE WIRE OR MAIL 3 PROVIDE THE FOLLOWING INFORMATION IN THE BODY OF YOUR ORDER A AR PART B FIRM ORDER DO NOT CANCEL C TYPE OF ORDER VIP ONLY D CUSTOMER CODE E CONTROL OR CUSTOMER ORDER A F MODEL AND SERIAL OF THE VEHICLE G FLEET CUSTOMER NAME H PARTS BOOK REFERENCE BOOK AND GROUP NUMBER J PROPER NOUN NAME NOTE ORDERS FOR AR PARTS CANNOT BE CANCELLED OR PARTS RETURNED PRICE AND AVAILABILITY WILL BE SUPPLIED UPON REQUEST TT 1987 GENERAL MOTORS SERVICE PARTS OPERATIONS M SB 4