A moving vehicle has a large amount of kinetic energy, and the brakes have to remove this energy in order to stop. How do the brakes do this? Each time you stop, your brakes convert the kinetic energy to heat generated by the friction between the pads and the disc. Through the process of cross drilling and slotting the rotors, not only are the rotors much lighter in weight, but they cool down much quicker and in turn, will have less failure. The unique slots in our rotors helps dissipate the gasses released from the brake pads during braking. This "de-gassing" or "out-gassing" will keep the pads in contact with the rotor resulting in less brake fade after repeated stops. Cross drilling of the rotors allows air to flow through the rotor, cooling the rotor material and the pad from the extreme heat generated by high speed panic stops; a brake component's worst enemy. Heavy brake users report reduced rotor warping, increased pad and rotor life, superior braking performance, faster stops with less fade, and improved wet-weather braking.
Caution: The Toyota 4Runners came with two sizes of front rotors 11.69" (297 mm) & 12.55" (319 mm) Diameter. This part is the larger 12.55".
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