Vacuum Power Brake Booster for Chevrolet C/K Pickup/Suburban 1973-1980, for Chevrolet Blazer 1977, for GMC C/K Pickup/Suburban 1973-1979, for GMC Jimmy 1974-1979 | OEM# 5471008, 18003678, 18003681

Compatible with Chevrolet：C10 Pickup 1974–1980C10 Suburban 1973–1980C20 Pickup 1973–1980C20 Suburban 1973–1980C30 Pickup 1973–1980K10 Pickup 1974–1980K10 Suburban 1973–1980K20 Pickup 1973–1980K20 Suburban 1973–1980K30 Pickup 1973–1979K5 Blazer 1976–1980Compatible with GMC：C15 Pickup 1974–1978C15 Suburban 1974–1978C1500 Pickup 1979–1980C1500 Suburban 1979–1980C25 Pickup 1974–1978C25 Suburban 1974–1978C2500 Pickup 1979–1980C2500 Suburban 1979–1980C35 Pickup 1974–1978C3500 Pickup 1979–1980Jimmy 1976–1980K15 Pickup 1974–1978K15 Suburban 1974–1978K1500 Pickup 1979–1980K1500 Suburban 1979–1980K25 Pickup 1974–1978K25 Suburban 1974–1978K2500 Pickup 1979–1980K2500 Suburban 1979–1980K35 Pickup 1973–1974K3500 Pickup 1979Diaphragm Diameter 10.85 INDiaphragm Diameter 275.59 mmHousing Diameter 10.559 INHousing Diameter 268.22 mmMaster Cylinder Stud Thread Size M10x1.5Stud Thread Size M10x1.5

• Vehicle Compatibility：Compatible with multiple Chevrolet and GMC full-size trucks and SUVs: Chevy C10 / C20 / C30 / K10 / K20 / K30 Pickup (1973–1980), C10 / C20 / K10 / K20 Suburban (1973–1980), K5 Blazer 1977, and GMC C15 / C25 / C35 / K15 / K25 / C1500 / C2500 / C3500 Pickup & Suburban / Jimmy 1973–1979.
• OEM Replacement Numbers：54-71008, 5471008, 18003678, 18003681, 18003686, 18005029, 18005040, 18005055.Fully interchangeable with the original factory part. Please confirm your OEM number or vehicle configuration before purchasing.
• Restore Braking Performance：Effectively restores vacuum pressure and braking assist function. Provides stable braking force, reduced pedal effort, and a smooth, consistent braking response in all driving conditions.
• Easy Installation：Designed as a direct-fit replacement for the factory unit — no modification or special tools required. Connects directly to the existing master cylinder and vacuum hose for quick and clean installation.
• Durable Construction：Built with reinforced steel housing and high-quality diaphragm materials to resist corrosion, deformation, and leakage. Each unit is individually tested to ensure long-lasting and reliable performance.