Power Brake Booster; Booster; Vacuum Booster. Part Type: Power Brake Booster. Pwr Brake Booster. Remanufactured Vacuum Power Brake Booster. Booster Type: Vacuum. 1992 GMC Jimmy with ST Stamped on Booster; with Brake Code JM3; GM Brake Codes are on the "Service Parts Identification" Sticker; without Master Cylinder; ;.
