Slotted Vented 1-Piece Rear Brake Rotors (T55-050) by SP Performance®. Quantity: 2 Per Pack. When you stomp on you brake pedal, can your brake rotors live up to the challenge? Aggressive driving, stop and go traffic or driving down a steep mountain road can cause extreme heat, resulting in brake fade. SP Performance Slotted Brake Rotors will live up to the challenge. The slots vent gasses that case your brakes to fade bringing your vehicle to a screeching halt. At higher braking temperatures brake pads start to expel gasses. These expanding gasses push the pads away from the rotor causing brake fade. SP Performance Slotted Rotors vent these gasses allowing the rotor and pads to stay in contact. The series of slots also wipe dust away from the pads and improve bite.