How brake pad friction affects ADAS

09 Sep.,2024

 

How brake pad friction affects ADAS

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What You Will Learn:

&#; Brake linings (pads/shoes) are rated for performance base upon temperature

&#; The coefficient of friction must betake into consideration when engineering the ADAS brake mitigation software

&#; Replacing linings with ones of a different frictional coefficient can increase the chances of a collision

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Brake pads make a difference

 

A model year vehicle is in your shop for brake work. The car has an advanced driver assistance system (ADAS) that includes automatic emergency braking (AEB) and traction control. All four rotors look serviceable, but the brake pads are worn and you replace them with an inexpensive aftermarket pad (OEM pads are too expensive). Will your choice of brake pads cause an unhappy customer leading to a comeback, an accident, or even legal problems for your shop?  

The customer picks up his vehicle, drives off and becomes distracted as he approaches a red light at a busy intersection. He fails to apply the brakes in a timely manner, but the ADAS attempts to come to the rescue. The ADAS uses radar/lidar to determine that the vehicle is not slowing sufficiently to avoid hitting a vehicle stopped in the intersection, so it commands the brakes, through the automatic emergency braking system, to apply braking force. The car starts to slow -- but not enough -- and it hits the other vehicle. Why did the AEB system fail? 

The replacement low-quality brake pads were made with a compound that had too low of a coefficient of friction (more on this later). Because the brake pad compound did not develop the same friction as quality aftermarket pads or OEM pads, the result was a fender-bender. This scenario could have been much worse&#;not stopping effectively for pedestrians in a crosswalk. Other issues with ADAS traction control can occur with brake pads that don&#;t perform as expected.   

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