welcome to x5 maint. mate

1. take it to the dealer or other local shops and have the mechanics look at your brake pads, rotors, and the sensor of the front and the rear.

it's prob. the sensor telling you that the brake job needs to be performed.

after the installation, you will have to reset the warning sign which can be done by yourself. no need to take it to the dealer to reset. if you need help send me messages