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19” one-piece drum/rotors
250" diameter sector shaft
For use on GM master cylinder with 1/2-20 front and 9/16-18 rear brake line ports
Professionally built in the USA
Delrin Bushings
1973-87 Chevy, GMC Truck Hydropower Brake Boost Kit with Bright Wilwood Master Cylinder Rack and Pinion Kits 1947-55 Chevy GMC 1st Series 3100 Truck 19” one-piece drum/rotorsOur Hydropower hydraulic brake assist power booster fits 1973 87 Chevy and GMC trucks and generates up to 1800psi of line pressure to the brake calipers. It is fitted with a Wilwood master cylinder and an adjustable proportioning valve. This kit is powered by hydraulic line pressure from the power steering pump. Firewall and valve cover clearance is equivalent to a 7" diameter vacuum booster. The firewall brackets are correct for 73 87 GM truck
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