The service guide in iDrive is just a count down. The pad sensors telling you your pads are worn out are actually seeing what's going on.
$275 for pad installation is crazy. I can do it with a floor jack and hand tools in an hour. A shop with a lift should be quicker.
2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R