ACDelco Original Equipment (OE) Brake Rotors with Ferritic Nitrocarburizing (FNC) Technology
Take a read through this blog to find out more on Ferritic Nitrocarburizing (FNC) technology and how it helps brake rotors resist corrosion and wear, as well as other tips for servicing brake rotors.

It’s no secret that brake rotors undergo a lot of punishment, from being squeezed by the calipers to enduring harsh environmental elements, such as snow, heat, ice, acid rain and road salt that can cause corrosion. Fortunately, ACDelco Original Equipment (OE) Brake Rotors are manufactured with Ferritic Nitrocarburizing (FNC) technology that helps them withstand those conditions while resisting corrosion and wear and can help double the lifespan of rotors. 

Introduced more than a decade ago on the 2009 Cadillac DTS, the Buick Lucerne Super and other GM models, FNC involves an extended manufacturing process that’s designed to harden and strengthen the rotors. With FNC, the rotor’s cast iron surface is bonded with nitrogen atoms under the intense heat of a giant, 560°C oven. Here, a 10-micron-thick transfer layer (about one-tenth the width of a human hair) is applied across the rotor surface as well as on the center “hat” section and inside the central cooling vanes of ventilated rotors.

The treatment not only helps slow the oxidation process, it creates a strong surface for stable friction and braking performance while providing corrosion protection and enhanced durability for longer life.

FNC also helps reduce rotor thickness variation that can lead to brake pedal or steering wheel shudder caused by the uneven build-up of rust on the rotors that occurs over time.

FNC provides an added benefit as well: It helps keep the rotors and wheel hardware looking cleaner and staying rust-free longer by producing less brake dust than with conventional rotors.

FNC rotors should not be turned or refinished to correct noise concerns, cosmetic corrosion, or premature or uneven pad wear. They should only be turned or refinished if adequate thickness is present for refinishing and one or more of the following conditions exist: excess thickness variation, excessive corrosion or pitting, cracks or heat spots, excessive blueing discoloration, or scoring that exceeds the maximum allowable specification.

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