Hawk Performance HB803B.639 Hawk 16-17 Ford Mustang Brembo Package HPS 5.0 Rear Brake PadsHawk Performance HB803B. 639 HPS 5. 0 For years, engine builders have been pushing motors to the limits of their ability, and at Hawk Performance, we're closer than ever to pushing the ABS Rev Limiter to its limits. The Hawk HPS 5. 0 (High Performance Street 5. 0) brake pad compound gives your vehicle the greatest possible stopping power and pedal feel without compromising ABS. HPS 5. 0 is a Ferro Carbon compound that provides advanced braking