BMW E90 brake pad wear warning
What does the E90 brake pad wear warning mean?
The warning tells you that the brake pads are getting low. There is no need to rush the replacement, but the disc thickness should be measured so that the discs can be ordered at the same time. In the service menu the wear is shown in yellow and red. You should check the pads yourself, because the on-board computer's information can be contradictory.
Why does the warning appear even though the pads still have material left?
The wear sensor's wire can be broken, which causes the warning. In addition, the sensor can touch the brake disc already when about half of the pad is left. If the pads have been replaced, you can reset the pad mileage and see whether the message comes back.
Does the wear sensor have to be replaced with the pads?
The sensor is bought separately: one for the front and one for the rear. Once the sensor has touched the disc and the warning has come on, it is worth renewing when the pads are replaced.