Auto Service Professional

FEB 2016

Magazine for the auto service professional

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34 | February 2016 that are designated as "brake paint"), but I've tried several brands and have never had long-term success. Eventually, surface rust will appear. Today, various rotor manufacturers offer rotors that feature coated hats (coatings vary; some are powder coated, some are ceramic coated, and some are coated with a "proprietary" process) that does provide long-term rust prevention. Calipers Obviously, caliper pistons must be com- pressed in order to allow room for the installation of new pads. Avoid using large channel lock pliers to push a piston. This can cause the piston to slightly cock in its bore, and you stand a chance of burring the piston contact face. Always use a dedi- cated piston compressor tool that provides a full-width fat face against the piston. In cases where the original pads have been severely worn down to minimum thickness, the piston(s) have been operating beyond their intended bore path. Foreign material, road debris, rust, etc., can build up on the piston walls. Pushing the piston fully back into its bore can result in lodging debris in the bore, resulting in a sticking piston that isn't able to freely travel within its bore. The Chassis A cracked rotor indicates a poorly manufactured rotor that was improperly cast with impuri- ties and or poorly heat treated. This is yet another reason to avoid bargain-basement rotors.

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