10. While adjustable valves are usually mounted with the knob facing downward, once the brake lines are plumbed into it, it would hang down way below the chassis, so we elected to mount it horizontally, as shown. We used a bracket leftover from another project, which mounts a regular proportioning valve to the master cylinder. The chassis was drilled and tapped to accept a 3/8-inch bolt. Note also how we used electrical tape to hold the brake lines in place prior to installing line clamps.