I saw somewhere that a special tool is needed to bleed the distribution block/valve next to the master cylinder. It is a plastic screw where you take out the plastic warning light screw with wire sensor and screw this in. Bleed the brakes, then replace the warning sensor screw. Is this necessary? Are there other brake bleeding techniques like bench bleeding the master cylinder? I don't know what that means either. I have everything apart for rebuild. I was going to put it all back together and do the normal bleed at the wheel cylinders. Thanks.