I thought the smaller rear brake calipers were the regenerative brakes? are these also the parking brakes? Are the brake pads the same even with Brembo calipers, or do the all have Brembo calipers. I find front and rear pads (no mention if Brembo makes a Difference) And the only other brake pads are refered to as Parking brake pads. Is there such a thing as A Tesla Service Manual ?