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Unlike factory calipers that have attachment bolts running through the sides of their bodies, the Track-4 system uses a radial-mount bracket that enables running the attachment bolts through the top of the caliper. When positioning the radial-mount bracket onto the caliper bracket, it should hang over the spindle, pointing toward the center of the car. It was torqued to the caliper bracket at 110 lb-ft with 14mm bolts. Afterward, Jarvis slid the new aluminum hub over the spindle pin, and locked it down with the spindle nut and a cotter pin.