The green Glafer pads will do no damage to rotors because of the organic/kevlar material used in them. I actually dont know what the green glafers look like, I just kinda know about the green pads because of the compound that is used. My take is organic pads burn up quick, and semi-mattalic pads or sintered pads last longer, grip better, and score rotors. Maybe I'm off on this, but I think thats how it goes.
The check valve should let air escape (push out) and seal on vaccum (let no air in). Install it the oposite of what the arrow says on the valve I gave you. ^motor^ away from motor.