Dear All,I am about to 'restore' a '81 628csi Manual, generally the car are in fair condition. Body work 8/10, interior 8/10, mileage below 10K( original) u better believe it. Every things work well accept for the brake master pump. I need the advise about, where can i get the replacement part? Can it be repair? Should I change it to hydraulic system? I hope to keep her as original as possible!beside that I have some used parts for sale eg. grill, head light, bumper with spoiler, etc.Thanks in advance.