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vanli Group
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Brake Pad


brake pad

Function of Brake Pad


When the brakes are hydraulically applied, the caliper clamps the two pads together into the spinning rotor to slow or stop the vehicle. When a brake pad is heated by contact with a rotor, it transfers small amounts of friction material to the disc. The brake pad and disc (both now with friction material), then "stick" to each other, providing the friction that stops the vehicle.

In disc brake applications, there are usually two brake pads per disc rotor, held in place and triggered by a caliper affixed to a wheel hub or suspension upright. Depending on the properties of the material, disc wear rates may vary.

The brake pads must usually be replaced regularly, and most are equipped with a method of alerting the driver when this needs to take place. Some have a thin piece of soft metal that causes the brakes to squeal when the pads are too thin, while others have a soft metal tab embedded in the pad material that closes an electric circuit and lights a warning light when the brake pad gets thin.


Types of Brake Pad

Semi Metallic Brake Pads

These types of brake pads are made from about 30% to 65% metal, and are commonly made out of steel wool, wire, copper or other metal materials. These types of brake pads are considered to be very durable, but also may wear brake rotors faster. Also, semi-metallic brake pads may not function well in very low temperatures.

Non-Asbestos Organic

This type of brake pad, commonly referred to as NAO, is made from organic materials such as fiber, glass, rubber and even Kevlar. These types of t pads are usually softer and don't create much noise, but they tend to wear faster and create a lot of dust.

Low-Metallic NAO

These are made primarily from an organic formula mixture with small amounts of copper or steel added to help with heat transfer and provide better braking. Because of the added metal, there is usually a considerable amount of brake dust and these pads are often noisy.

Ceramic Brake Pads

Ceramic brake pads are composed primarily of ceramic fibers and other filler materials. While ceramic brake pads are usually more expensive than other types of pads, they are cleaner and produce much lower noise levels. Also, they provide for excellent braking and don't cause a lot of wear on the brake rotors.