I have a Champion GW trike, 2005 kit. I am going to bleed the rear brake system. There are two bleed screws on each rear wheel caliper. They are positioned so that one is on top and one is on the bottom for each caliper. First, which wheel should I bleed first (left or right)? Second, for the bleed screws on each caliper, do I need to do both for each caliper, first one and then the other one, or should I just do the top one or just the bottom one. I am using a MityVac bleeder.