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Hard to see but there is a valve mounted under the master cylinders. This is what I'm using for a parking brake. You step on the brake pedal and close the valve to trap pressure to the rear brakes. The valve is designed for this purpose and is spring loaded so that it is only on when you want it on. This allows me to run 12.19" discs and large 4-piston Wilwood calipers with 15" wheels on the rear. I couldn't find an internal drum type parking brake that would work with the NHRA required c-clip eliminators and adding a block valve is much easier than running a parking brake handle and cables. The goal was to run the largest rear brakes that would fit inside 15" wheels. There are way more drag slick options for 15" wheels than 18".