Organic brake pads are made from a mixture of non-metallic fibers, friction modifiers, fillers, and a binding resin that holds everything together. The exact recipe varies by manufacturer, but the core ingredients fall into a few consistent categories: reinforcing fibers (like glass, rubber, carbon, or Kevlar), a phenolic resin binder, friction-adjusting materials like graphite, and bulk fillers such as barium sulfate. Unlike semi-metallic pads, organic formulations contain little to no metal content.
The Binding Agent: Phenolic Resin
Every brake pad needs something to hold its ingredients together under extreme heat and pressure. In organic pads, that job belongs to phenolic resin, a type of synthetic polymer that acts as the glue of the entire pad. Phenolic resin is the industry standard because it offers high compressive strength, strong corrosion resistance, good heat tolerance, and bonds well with the various fillers mixed into the pad. It’s also inexpensive and easy to work with during manufacturing.
The resin typically makes up around 20 to 30 percent of the pad by weight. During production, it’s ground into a fine powder and blended with all the other dry ingredients before being compressed and heated into the final pad shape. Some manufacturers use modified versions of phenolic resin, incorporating elements like boron or other compounds to improve thermal stability at higher temperatures.
Reinforcing Fibers
Fibers give organic brake pads their structural strength. Without them, the pad would crumble under the force of braking. Common choices include glass fiber, aramid fiber (the same material family as Kevlar), carbon fiber, and rubber. These fibers are woven throughout the pad material, creating an internal skeleton that resists cracking and helps the pad maintain its shape as it wears down.
The fiber blend also influences how the pad feels during braking. Aramid fibers, for example, are lightweight and strong, contributing to a smoother pedal feel. Glass fibers add rigidity and heat resistance. Manufacturers adjust these ratios to target different performance profiles, which is why two organic pads from different brands can feel noticeably different on the same car.
Fillers and Friction Modifiers
Fillers make up the largest portion of an organic brake pad by weight, sometimes 40 percent or more. Barium sulfate is one of the most common, serving as a bulk material that also improves thermal conductivity and mechanical strength. It’s dense and stable, giving the pad mass without interfering with braking performance.
Friction modifiers fine-tune how aggressively the pad grips the rotor. Graphite is a standard addition at around 5 percent by weight, acting as a solid lubricant that prevents the pad from grabbing too harshly. This smooths out the braking action and reduces heat buildup. Other modifiers like rubber particles or cashew shell dust help absorb vibration and manage the friction coefficient across different temperatures.
There’s also a growing trend toward natural, plant-based fillers. Researchers have tested walnut shell powder for frictional stability, coconut shell powder for thermal insulation, and peanut shell powder for abrasion resistance. These bio-based materials are showing up in newer eco-friendly formulations as manufacturers look to reduce reliance on synthetic compounds.
What Organic Pads Don’t Contain
The term “organic” in brake pads is sometimes called NAO, which stands for non-asbestos organic. This name exists because brake pads were historically made with asbestos fibers, which were eventually phased out due to serious health risks. Modern organic pads contain no asbestos and very little metal.
Copper is another ingredient that’s being eliminated across all brake pad types. California and Washington passed laws restricting copper content because brake dust washes into waterways and harms aquatic life. As of 2021, brake pads sold in California could contain no more than 5 percent copper by weight. By 2025, that limit dropped to 0.5 percent, effectively near zero. Organic pads were already low in copper compared to semi-metallic options, but these regulations have pushed the entire industry toward copper-free formulations.
How They’re Manufactured
Making an organic brake pad is essentially a four-step process. First, all the dry ingredients, the powdered resin, fibers, fillers, and friction modifiers, are blended together in a mixer until the composition is uniform. Next, the mixture is placed into a brake pad-shaped die and preformed under light pressure to create a rough shape.
The preformed pad then goes into a compression molding machine, where it’s subjected to high heat and heavy pressure simultaneously. This is the curing stage, where the phenolic resin melts, flows around all the other particles, and then hardens into a rigid composite. Finally, the cured pad goes through a post-curing oven for additional heat treatment that finishes the chemical bonding process and ensures dimensional stability. The result is a dense, uniform pad ready to be attached to a metal backing plate.
How Organic Pads Compare in Practice
The material makeup of organic pads creates a distinct set of tradeoffs. Because they’re softer than semi-metallic or ceramic pads, they produce less noise during braking. Semi-metallic pads, which contain steel fibers and iron powder, tend to be the loudest of the three types. Ceramic pads are the quietest. Organic falls in between, though closer to the quiet end of the spectrum.
That softness comes at a cost: organic pads wear out faster. You can expect roughly 30,000 to 40,000 miles from a set of organic pads under normal driving conditions, compared to 50,000 to 60,000 miles for semi-metallic pads. The softer compound also means organic pads generate more dust, which you’ll notice as a dark residue on your wheels.
Organic pads perform best in everyday, moderate-temperature driving. They’re gentler on rotors, which can save money on rotor replacements over time. However, they’re not ideal for heavy-duty use like towing, mountain driving, or aggressive braking, where the heat can exceed what the phenolic resin and organic fibers handle comfortably. In those conditions, the pad’s friction coefficient drops and stopping distances increase, a phenomenon called brake fade. For most commuters and city drivers, though, the material composition of organic pads is well-matched to the demands they’ll face.