Heat from the brakes will not get into the bearing. The braking system wouldn't reduce braking heat. It would take a mechanical failure to get enough excess heat to damage a wheel bearing. Having electrical control wouldn't stop a mechanical failure. And guess what smart ass, I do have certification in this area and I have direct air brake experience. I also know about the shitty electric controls for air brake systems. The only way to get enough heat is if the brake is dragging when in the released position. The electronics couldn't release a dragging brake. Most wheel bearings fail because wheel seal failures.