BUICK BRAKE SYSTENI 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 BUI l3I i A CAR BRAKE SYSTEM CHART GVWR ENGINE RPO Less than 1784 KG 2 8X JA1 Power Brake System Lt Duty 2 5R 2 5 5 JA1 Power Brake System 1784 KG to 1815 KG 2 8X JA2 Power Brake System Med Duty 3 0E 4 3T JA2 Power Brake System Hvy Duty 1983 BUJDIDK A CAR BFIAKE SYSTEM CHART GVWR ENGINE RPO Less than 1784 KG 2 5R 2 5 5 JA1 Power Brake System Lt Duty 1784 KG or Greater 2 5R 2 5 5 JA2 Power Brake System Hvy Duty 2 8X 3 0E 4 3T JA2 Power Brake System Hvy Duty L j 1993 GENERAL MOTORS SERVICE PARTS DPERATI 3NS BUlCK 44A 4 93 was 4 500