Originally Posted by G-Benz

On pre-SBC model MBs, you can DIY pad and rotor changes without special equipment.

The SBC system periodically "tests" the brake system, and when active, will push the pistons against the pads...and rotors. You don't want this occurring while your hands are in there replacing pads!!

I have read at least one post where someone was able to successfully change pads on his SBC-equipped model. My guess is that he probably disconnected the battery.