Auto Service Professional

FEB 2017

Magazine for the auto service professional

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30 | ASP February 2017 Technical offer quality and performance that meets or exceeds original equipment. Rotor coatings Preventing rust buildup on a brake rotor offers two benefits: to improve visual appeal when the rotor is visible behind an alloy wheel, and to minimize corrosion that can lead to clogging the vents and overheating. While non-frictional surfaces such as rotor hats and vents can be treated with a variety of methods including electro-coating (often referred to as e-coating and is usually black in color), frictional surfaces may be zinc coated. is provides a superior pad bed-in and bite, while maintaining a rust-free appearance for a much longer period of time and use. According to Centric, e-coating is an advanced electro-statically applied finish that has been engineered to withstand 400 hours of salt spray testing without corroding. at means much longer service life, especially on icy, salt-encrusted winter roads. e coatings used on the Raybestos R-300 rotors involves a "black fusion" coating on the hat and a "grey fusion" coating on the disc and vane surfaces rated as withstanding 300 hours of saltwater exposure. Many performance rotors available today feature similar coatings that greatly extend the appearance factor. If the disc area is coated, it is not recom- mended to remove this during installation. During installation, it's advisable not to clean the disc area with a strong solvent such as brake cleaner. Instead, wash the rotors with hot water and Dawn dish washing liquid, followed by a rinsing. is will remove any residual oils and contaminants without disturbing the coating. Vented and solid rotors Vaned/vented rotors are designed to release heat from the rotor. As the rotor rotates, the vanes pump cooler air from the center Aftermarket performance rotors are offered in a variety of designs. Examples shown here (from left to right) include slots, slots and cross-drilled holes and cross-drilled holes only. Note that non-friction surfaces are e-coated to prevent rust and to maintain a like-new appearance. Photo courtesy of Centric Brakes These cutaway views illustrate curved vanes. Rotors with curved vanes should always be mounted so that the outboard end of the vanes aim toward the rear of the vehicle. Photo courtesy of Centric Parts

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