Rick's Free Auto Repair Advice

Posts Tagged: Brake rotor finish

Brake rotor finish

Brake rotor finish How smooth does the brake rotor finish have to be? Brake Rotor Roughness Average Brake rotor surface “smoothness” is rated by its Roughness Average (RA). The RA should be below 80. The proper RA is critical to achieving the proper transfer layer for adherent style brake organic and ceramic pads as well as abrasive semi-metallic brake pads. If the surface is too smooth, it’s impossible to form a transfer layer onto the rotor face. If it’s too rough, the brakes will make noise, wear faster and even … Read More


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