Are you referring to the underlayment soundproofing mat that goes onto the steel floor? My car has that material, then jute rug padding, then the carpet. I cut out a circle of the underlayment larger than the big rubber plug that accesses the master cylinder and left it there. Then I cut a flap of the jute, leaving it there. When I check the master cylinder, I roll the carpet up from the bottom, lift the flap of jute and the circle of underlayment to get at the cover to the master cylinder. I guess Ford wanted this to be a challenge. He had a few others we all know about....