I replaced all of my hard lines in my 100 series a couple of months ago. I bled the system according to the instructions from guys on here. While my brakes seem to be working fine, on start up and randomly while driving the pump is making a slower lower pitched almost grinding noise now as opposed to the smoother cycle noise it made before. It just started this in this past week. If I didn't get all of the air out of the lines would this cause the pump to cavitate? any ideas on this?