My 2002 325xi Sedan has a problem with the Front Drivers Side Brakes that has my local repair guy stumped. Only on the front left, the brakes are on a little bit causing the rotor to heat up a lot and making a burning brake smell after a drive of a couple miles. When I stopped I can kick up snow on that wheel and it burns and sizzles, but the other wheels are merely warm. Oddly it doesn't pull to the side, but I can feel that it doesn't coast as long as it used to. The repair guy suggested changing out the caliper, but with little idea if that would fix it. Has anyone seen this before? Thanks.