Excessive heat can cause resins in your brake pad to vaporize or "outgas." As the brake pad wears, the used friction material turns into a fine dust. This boundary layer of heat, gas and dust builds up between the pad and rotor surfaces and inhibits performance. Here's where StopTech SportStop slotted brake rotors make a big difference. StopTech SportStop Slotted Brake Rotors are a true performance rotor and feature:* Power Alloy castings (on select applications)- Engineered Performance Rotor- Superior resistance to cracking due to thermal stress- Increased molybdenum (higher carbon)content that extends reliability, service life and helps reduce NVH “noise” issues- Rotor material is a direct descendant of the patented AeroRotor from StopTech* Introducing directional curve vane design (on select applications)- Improved vane design or OE equivalent on all rotors- Center split castings* New short slot design runs perpendicular to the vane to preserve rotor strength.* Direct OE Replacement* Improved wet weather response* Increased initial “bite”* Double disc ground for a consistent friction surface and Improved pad bed-in* Mill balanced* Black E-Coated non-friction surfaces on “Power Alloy” rotors* Enhances open wheel appearance