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As a result, the reduced contact points on the rotor are more prone to overheating and hardening, which sets up the potential for vibration and noise. Additionally, the “peaks and grooves” prevent the proper rotor surface area from contacting the disc pad.

These fragments end up embedded in the brake pad and create noise. If this secondary finish is not performed, the rotor surface fragments break off during the initial brake applications and become trapped into the microscopic grooves or valleys of the rotor. A former alternative method is to apply a non-directional finish utilizing a ball hone to provide the required surface finish of 14-75 Ra. The recommended procedure is to block sand for 60 seconds per side with 120 grit sandpaper followed up with 60 seconds of 150 grit sandpaper. Most shop lathes will require a secondary finish procedure to break off the “mountain peaks” that are produced when the brake rotor is machined. Many new rotors are machined to a mirror-like finish and require no additional machining prior to installation. Obtaining the proper rotor surface finish is critical to reducing brake noise and eliminating comebacks. When dragging a fingernail over the rotor surface, it should feel glass smooth. The smoother the rotor finish, the better. The Federal-Mogul Motorparts’ Technical Education Center and the Rotor & Drum Engineering Facility have teamed up to provide the following information and recommendations. Proper rotor surface and cleaning are critical to overall braking performance. Many service technicians are experiencing comebacks on disc brake pads sooner than they expected due to noise. Cleaned Caliper Bracket | Lubed Guide Pins | Properly Lubed Guides Proper Rotor Preparation Prevents Brake Noise Note: Molybdenum Disulfide is effective in wet or corrosive environments over a wide range of temperatures. Use premium quality Wagner ThermoQuiet ® brake pads.DO NOT lubricate or apply any compounds on the backing plate of Wagner ThermoQuiet® with “IMI” brake pads.Lubricate metal-to-metal friction points (brackets to guides/guides to pads) with a Molybdenum Disulfide lube, commonly called Moly Lube.

Lubricate metal-to-rubber friction points (guide pins to boots) with silicone lube (Wagner # F132005).

Use a wire brush or sand/bead blasting to remove rust from caliper brackets/guides.

Wagner ThermoQuiet® brake pads include an Integrally Molded Insulator (IMI) which will not delaminate or migrate during use. To provide long, quiet, brake service life, we recommend: Pad Guide Rust/Corrosion | Pad Rust Buildup | Rust Jacking – No Pad Movement This will allow proper caliper/pad movement to ensure maximum brake performance and customer satisfaction. Federal-Mogul Motorparts‘ Technical Education Center recommends a meticulous cleaning and lubricating of all caliper brackets and mounting points.

Failure to clean rust buildup and properly lubricate caliper brackets during brake service is proven to be a major cause of brake noise, premature wear and increased stopping distance.