Just towed a 2008 Scion xB. The LR wheel apparently locked up but is now free. That wheel is brown and so is the bumper behind it, I'd assume the caliper seized and it was driven until the pads burned off. Issue now is that caliper is opened, that brake/caliper is still somewhat working but making some angry noises. Also the brake reservoir is full and clean, and it's not leaking fluid anywhere. When the engine is off, the brake pedal does NOT firm up after pressing it a bunch of times-it gets stiffer but still easily goes to the floor. You do have to pump the brakes to slow down so I haven't driven it over 15mph. So...I'm not sure if the caliper seized or what. And if the brake booster was bad wouldn't it be leaking? Just trying to figure out where to start. Wondering also if the ABS module is dead. No idea how to figure this one out.