A great many RB44's haven't been used for a number of years, my own RB44 had sheets of paper in the visor dating back to 2008. At the last tender sale one of the vehicles had a docket dating from 2002 when it was shipped back from Cyprus.
I would suggest that you have someone look at the brakes before driving it again, it certainly won't pass its first MOT at VOSA.
Every now and then my RB snatches to the left but Reynolds Boughton were supposed to have cured these problems. Changing the braking system would be notifiable change I think with VOSA.