Universal TriFlex™ Proportional Brake Control (51140) by CURT®. Compatible with anti-lock brakes and cruise control, operates 2-8 brakes, automatic leveling and calibration. Automatically adjusts brake output when going up or down a hill, sensitivity adjustment for varying trailer loads or driving conditions. Mounting hardware included. Inertia-based brake control. Curt has everything you need to set up your car or truck to tow, starting with CURT hitches and accessories. Tow in comfort and safety with the proper gear, and make your life easier around the campsite or while traveling with CURT accessories.