Ceramic pads run quieter and cleaner and suit most daily-driven cars; semi-metallic pads handle more heat and heavier loads but run louder and dustier; organic (NAO) pads are the softest, quietest option for light-duty use but wear and fade the fastest. The right choice depends on what the vehicle actually does, not which pad sounds the most premium.
How Brake Pad Friction Material Works
Every disc brake pad is a friction compound bonded to a steel backing plate, and the compound is what separates the three families. According to Aisin's Advics brake division, semi-metallic pads carry 30 to 50 percent steel content blended with other metallic fibers and a graphite lubricant, giving the pad a hard, heat-tolerant structure. Low-steel pads cut that to 10 to 30 percent steel as a middle ground. Non-steel, or organic (NAO), pads use little to no steel at all, relying instead on fiberglass, aramid fibers, and resin binders for a softer compound. Ceramic pads are a different chemistry entirely - Advics describes true-ceramic formulations as requiring more than 20 ingredients that must be formulated and fused specifically for each vehicle application, rather than one generic recipe scaled up or down.
Semi-Metallic Pads: Built for Heat and Load
Semi-metallic friction material is built to shed heat. The metal content conducts heat away from the pad face and helps the braking system recover between hard stops, which is why semi-metallic pads are the common choice for towing, hauling, and performance driving. Trade publication Vehicle Service Pros notes that semi-metallic compounds provide better braking over a wider range of temperatures and conditions than ceramic, at the cost of more noise and a more abrasive effect on the rotor face. Expect more brake dust, a coarser dust that clings to the wheel, and shorter rotor life under aggressive use.
Ceramic Pads: Quiet, Clean, and Now Copper-Free
Ceramic compounds trade some outright heat capacity for comfort. The dense ceramic matrix dampens vibration, which is a large part of why ceramic pads run quieter than semi-metallic, and they shed a lighter, lighter-colored dust that is less likely to bake onto the wheel finish. Akebono, which says it built the first copper-free original-equipment pad formulation sold on a North American passenger vehicle, markets its ceramic ProACT line on low noise, low dust, and consistent pedal feel without a drop in stopping performance compared to its older formulations. Ceramic pads also tend to be gentler on rotors than semi-metallic. The tradeoff is price - ceramic compounds cost more to produce than organic or semi-metallic - and in sustained, very high-heat use (mountain descents, track days, heavy towing) a street ceramic pad will fade sooner than a semi-metallic or performance-oriented compound built for that duty.
Organic (NAO) Pads: The Quiet, Light-Duty Option
Organic, or NAO (non-asbestos organic), pads sit at the soft end of the friction spectrum. With little to no steel in the mix, they are naturally quiet and gentle on rotors, and they are typically the lowest-cost of the three families. The same softness that keeps them quiet also means they wear faster than ceramic or semi-metallic pads and lose stopping power sooner under sustained heavy braking or heat, which is why most automakers reserve organic compounds for lighter-duty applications rather than trucks, SUVs, or vehicles that tow.
Ceramic vs Semi-Metallic vs Organic at a Glance
| Factor | Semi-Metallic | Ceramic | Organic (NAO) |
|---|---|---|---|
| Steel/metal content | 30-50% steel plus other metal fibers | No steel; copper-free ceramic matrix | Little to no steel |
| Noise | Noisiest of the three | Quietest, dampens vibration | Quiet when new, can glaze with age |
| Dust | Heaviest, coarsest, clings to wheels | Lightest and lighter-colored | Moderate |
| Rotor wear | More abrasive on rotors | Gentler on rotors | Gentle on rotors |
| Heat range | Widest; best for towing/heavy use | Strong for daily driving; can fade in sustained extreme heat | Narrowest; light-duty only |
| Typical cost | Mid-range | Highest | Lowest |
The Low-Copper Law Changed What's Inside Every Pad
If you compare an older semi-metallic or ceramic pad to one built in the last few years, the recipe has changed even if the pad family name hasn't. Washington State's Better Brakes law, which California adopted in parallel, phased copper out of friction material in two steps: pads made after January 1, 2021 had to fall under the "Level B" threshold of less than 5 percent copper by weight, and pads made after January 1, 2025 must meet the stricter "Level N" threshold of less than 0.5 percent copper by weight. The same law also caps asbestos, hexavalent chromium, mercury, cadmium, and lead at 0.1 percent or less. Copper used to help pads conduct heat and build a stable friction film, so manufacturers like Akebono had to re-engineer ceramic and semi-metallic compounds to hit the same pedal feel and fade resistance without it. In practice, a current Level N pad from a reputable brand should brake as well as the copper-formula pad it replaced - the law changed the chemistry, not the performance target.
What to Buy, and What to Replace at the Same Time
Match the pad family to how the vehicle is actually driven, not to marketing language. A commuter car or crossover that mostly sees city and highway miles is well served by a quality ceramic brake pad for the quiet, low-dust ride. A truck, SUV, or any vehicle that tows or carries heavy loads holds up better on a semi-metallic compound built for sustained heat. Whichever family you choose, buy pads and rotors as a set when the rotors are worn, scored, or outside spec - a new pad on a damaged rotor won't seat correctly and will wear unevenly - and replace the hardware kit (the shims, clips, and anti-rattle hardware) at the same time rather than reusing corroded pieces. Browse the full brake pad selection by vehicle and friction type to compare what fits your specific application.
Mistakes People Make Choosing Brake Pads
The most common mistake is picking a pad on noise and dust alone and ignoring duty cycle - a soft, quiet pad on a vehicle that regularly tows or carries heavy loads will fade and wear out quickly, while an aggressive semi-metallic pad on a light commuter car is louder and dustier than it needs to be. The second is reusing old, glazed, or corroded hardware with new pads, which causes the new pads to drag, wear unevenly, or squeal regardless of friction material. The third is skipping the rotors when they're outside spec just to save money on the pad swap, which shortens the life of the new pads and can bring the comeback right back to the shop. If you still have questions about a pad purchase, warranty, or return, our FAQ page covers the common ones.
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Shop Brake Pads & Kits →Frequently Asked Questions
Are ceramic brake pads better than semi-metallic?
Neither is universally better - ceramic pads run quieter, cleaner, and easier on rotors for typical daily driving, while semi-metallic pads handle sustained heat and heavy loads better, which matters more for towing, hauling, and performance use.
Do ceramic brake pads still contain copper?
Reputable current ceramic pads are formulated to meet the Level N copper threshold (under 0.5 percent by weight), and brands such as Akebono market lines built around copper-free formulations rather than the copper-rich ceramic compounds sold before the 2021-2025 phase-in.
Why are my brakes squealing after a pad change?
New-pad squeal is most often reused or corroded hardware, glazed rotors, or pads that haven't fully bedded in yet - swapping in a fresh hardware kit and bedding the pads with a series of moderate stops resolves most cases.
Can I mix pad types front and rear?
Yes - many vehicles run a different friction compound front to rear from the factory because the front and rear brakes carry different loads, so matching each axle to its own duty cycle is normal and not a mismatch to avoid.
Do I need to replace rotors every time I replace pads?
No, but you should measure and inspect them - rotors within spec and free of scoring or hard spots can be resurfaced or reused with new pads, while worn, warped, or undersized rotors should be replaced alongside the pads.
Which pad type produces the least brake dust?
Ceramic pads generally produce the lightest and lightest-colored dust of the three families, which is a large part of why they're favored for daily-driven cars with alloy wheels.
Sources
- Vehicle Service Pros / Advics - composition and performance differences between ceramic and semi-metallic friction material.
- Tire Review - steel content ranges for semi-metallic, low-steel, and non-steel/organic pads, and ceramic formulation detail from Aisin and Raybestos.
- Akebono Brake Corporation - Level B and Level N copper thresholds and Akebono's copper-free ceramic formulation history.
- Washington State Department of Ecology - Better Brakes law copper phase-out dates and heavy-metal limits for brake friction material.