Hmmmm, this is why I have mechanicals, so I don't have to worry about spacers, hoses or anything. The pad springs should keep the pads in place and if the piston(s) were in any danger of popping out if a lever was depressed it'd only be because the brakes needed a massive amount of adjustment anyway. The only thing I care about are the discs, I always take them off any wheel I have to remove and tape them to the inside of the box.. Otherwise, it's ZFG.