CHEVROLET BRAKE SYSTEM CHART The charts listed below have been developed to facilitate identification of 1982 83 A car brake system application These charts use either engines or Gross Vehicle Weight Ratings GVWR or a combination of both to identify specific brake RPO s Please note that GVWR s can be found on the certification label located inside the driver s door For 1984 and forward refer to vehicle option label for brake system identification 1982 CHEVROLET A CAR BRAKE SYSTEM CHART GVWR ENGINE RPO Less than 1784 KG 2 5R 2 5 5 2 8X JA1 Power Brake System Lt Duty 1784 KG to 1815 KG 2 5R 2 5 5 2 8X JA8 Power Brake System Med Duty 4 3T JA2 Power Brake System Hvy Duty 1983 CHEVROLET A CAR BRAKE SYSTEM CHART GVWR ENGINE RPO Less than 1784 KG 2 5R 2 5 5 2 8X JA1 Power Brake System Lt Duty 1784 KG to 1815 KG 2 5R 2 5 5 2 8X JA8 Power Brake System Med Duty 4 3T JA2 Power Brake System Hvy Duty 1991 GENERAL MOTORS SERVICE PARTS OPERATIONS CHEVROLET 17A j 5 91 4 85 4 500