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Servicing ADAS & Brake Pads

If your shop is performing brake repairs, you are already able to service most ADAS vehicles.

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All ADAS systems are basically layers of software and sensors on top of brake, suspension and steering systems. This means that even the most sophisticated laser, camera or radar system still needs to have a brake pad and rotor to carry out the correction in an emergency or during normal operation.

Autonomous-Emergency-Braking
Even the most sophisticated laser, camera or radar system still needs to have a good-working brake pad and rotor to carry out the correction in an emergency situation or during normal operation.

Friction Confusion

Deep in the software of any ABS, stability control or ADAS system that relies on the brakes to carry out a correction, the system knows that for a given amount of hydraulic pressure, the brakes will produce a specific amount of brake torque. This is built around the friction profile of the original brake pads.

If the brake pads are replaced with a friction material that is significantly different than the original material, it could cause issues with an ADAS system. The corrections could take longer to bring the vehicle under control if the brake pads don’t produce enough friction.
If the new friction material is too aggressive, it could cause abrupt corrections or even an over-correction. With adaptive cruise control system, the driver may notice jerky performance.

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Fade Control

On most vehicles, the brake controller monitors brake use when the ABS, stability control or ADAS systems are interacting with the brakes. The software algorithm can estimate fairly accurately the temperature of the brake pads without using an actual brake pad temperature sensor to predict how much the brakes are starting to fade.

The controller keeps track of to what extent the brakes are being used. If the controller estimates the brakes are overheating, it may temporarily discontinue ABS, traction control and/or stability control to give the brakes a chance to cool down. Some manufacturers call this brake fade compensation. On some early ABS systems with traction control, drivers would often overheat the brakes trying to get out of a snow bank if the system was left on.

Because brake fade compensation is programmed for the hot friction characteristics of the original equipment brake pads, it should be obvious that any replacement brake pads for these vehicles should have friction characteristics that closely match the original pads.

ADAS

Caliper Condition

Another factor in the ADAS equation is the condition of the brake calipers. If a caliper has a frozen guide pin, the effectiveness of the brakes will be compromised. Before ABS, the customer might complain of a brake pull. With ABS, the system counteracts the unequal brakes by reducing brake pressure on the opposite side to keep the vehicle going straight.

In the past, the driver could adapt to small changes in the condition of the brakes by applying a little more or less pressure on the brake pedal. ADAS can adapt accordingly, but if a replacement part falls outside the performance parameters it can cause problems.

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