This 5 port valve works great on factory cars that have been converted to rear disc brakes. This valve is preset for disc brakes in the front and rear. The 5 ports are; 2 ports on top for the lines from the master cylinder to the valve, 1 right front port, 1 left front port and 1 port for the front to rear brake line. This valves serves as a replacement on all GM cars from 1971-88. This valve is also used on GM rear disc brake conversions. There is no adjustment on the valve. It is set to be 50% front brake, 50% rear brake pressure.
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