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1964-1972 GM A F X Body BLACK Hydro Boost Power Brake Booster Milled Flat Master 1964 to 1972 GM A F X Body BLACK Hydro Boost Power Brake Booster Milled Master Click images to enlarge Description The Hydro-Boost is powered by hydraulic pressure from the power steering pump. It requires 'no vacuum'. This has several advantages. No external vacuum pump required on low vacuum high performance motors. No 'small bore' master required. Firewall and valve cover clearance is increased. Frame mounted cle...

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