Well, I stored our 2005 XF Roadster for the winter periodically staring her up. There were no problems of any kind except needing a new battery. We got her out last weekend to go for a drive. Immediately, the brake pedal went almost to the floor, but pumped up w/1 pedal pump. We only went about 10 miles & this happened every time I tried to stop.

Is this the master brake cylinder?