Image of brake pad source IndiaMart

Cars give us the convenience of moving around without any hindrance. You can travel from one place to another using your car. As a driver or a car owner, you should strive to know some technical facts about your car. One of them is the friction coefficient of brake pads.

What is the friction coefficient of brake pads? How does it affect your driving? Doe sit affect the quality of brake pads?

To find the answers to these and other questions that relate to the coefficient the brake pads, read on to the end of this article.

What is the Coefficient of Friction of Brake Pads?

In the field of mechanics, the coefficient of friction can be defined as the relationship between the frictional force that is existing between two objects and how these two objects are responding to that force.

In a car’s braking system, the coefficient of friction is between the brake pads and the brake rotors.

Since there are movements involved in the two objects, the coefficient of friction here is dynamic. This is because the brake rotor is moving against the brake pads.

The coefficient of friction for brake pads does not have a defined or universal value. Instead, it depends depending on the type of materials used.

In our case, it means that the type of brake pads that you are using on your car will determine the coefficient of friction.

Image of coefficient friction brake pad source frontechchina

Does the Friction Coefficient of brake Pads affect the Performance of the Brake System?

When buying brake pads in China, you should know that the friction coefficient of brake pads has a direct impact on the overall performance of the car’s brake system.

The friction coefficient should not be too high or too low. This is contrary to the popular notion where people prefer to buy brake pads that have a high friction coefficient.

So, how does the friction coefficient of brake pads affect the braking performance?

When cruising at a high speed and you want to apply emergency brakes, an extremely low friction coefficient will result in a rigid braking process.

You will not experience a smooth and predictable braking process.

On the other hand, an extremely high friction coefficient will cause the brakes to lock in case you are cruising at a high speed.

The end result is the vehicle will skid and compromise on your safety.

Factors that Affect the Coefficient of Friction of Brake Pad

There are two main factors that can affect the friction coefficient of brake pads. These are the materials that are in contact and the force that is acting between the two brake pads.

By now you know that there are different types of brake pads and they are made of different materials.

These materials include metal, ceramic and a combination of metal and organic materials. Some materials have a high friction coefficient while others have a low coefficient.

External factors such as temperature can also affect the friction coefficient of brake pads.

High-quality brake pads are designed to function well even when the environmental temperature is high.

The friction coefficient of low quality brake pads can drop when the temperatures are high. In doing so, the performance of the brake system will go down.

Levels of Brake Pad Friction Coefficient

Image of brake pad lining source frontechchina

The friction coefficient of brake pads is divided into different levels. These levels are as follows:

-EE class 0.25-0.35: This friction coefficient level is ideal for American and European cars. These brake pads are large and have a low friction coefficient.

-FF class, 0.35-0.45: This is the international recommended standard friction coefficient for the brake pad.

-GG class, 0.45-0.55: This class is popular in German cars. It is quite high to be in tandem with the high speed limit of those cars.

-HHH, 0.55-0.65: Such brake pads for sale are designed for areas that experience high temperatures. This is because a major increase in temperature can result in a significant decrease in the friction coefficient for the brake pad.

So, which level of friction coefficient of the brake pad is the best? There is no perfect level of friction coefficient.

This also means that higher levels deliver the best results. The best thing is to choose the best brake pads that will suit the needs of your car.

For instance, on-road cars have the GG friction ratings while the race brake pads have the HH rating.

The biggest issue with brake pads with a high coefficient of friction is they have a short lifespan. For example, the HH brake pads which are designed for supercars should be replaced after a single race.

Now that you understand the friction ratings of brake pads You can confidently buy the right brake pads online or go at the manufacturer’s place.

How many mm Should Brake Pads Be?

When buying the brake pads, you should take note of its thickness in terms of millimeters.

In most cases, a new brake pad will have a thickness of 12mm of friction material.

As expected, the friction material will start wearing out with time and you will need to replace the brake pads.

Most reliable brake pads manufacturers and mechanics advise that you should do a brake pads replacement when the material gets to 3 or even 4mm of thickness.

You should do the replacement in time before the backing plate of the brake pad gets into direct contact with the brake rotors. Once this happens, you will be forced to spend more money on major damage.

What is the Difference Between Brake Lining and Brake Pads

Image of brake pad. Source Auto repair

When it comes to the issue of coefficient friction for brake pads, there is usually confusion between the brake lining and brake pad.

The confusion is mainly because both form part of the disc brake system.

The truth of the matter is brake lining is a part of the brake pad. It is the section that exerts a frictional force on the brake disc when you engage the brake.


At this point, it is pretty clear that you should not be confused by the issue of the brake pad friction coefficient.

You are now able to choose the right brake pads based on their friction coefficient.

All you need is to find a reliable brake pad manufacturer in China and select the right brake pads.

Read more

Different classes of friction coefficient for brake pads

The meaning of brake pad friction rating