Brembo 25121 Rear Solid Brake Rotor To ensure maximum safety over time, Brembo uses highly advanced calculation and simulation systems in designing its brake rotors, to obtain peak performance Precise tolerances offer maximum performance, increased comfort, and extended longevity of the brake-system components The braking surface is machined to exact OEM specifications to ensure synergy between the friction material and rotor during the run-in period An electronic balancing system is used during the production process to eliminate an unbalanced weight distribution, thus eliminating the risk of vibrations The innovative Brembo-patented pillar venting technology increases overall rotor cooling and provides 40% more resistance to thermal cracking