I have nearly the same problem ? I have just bought a 1973 series 3 petrol ( no servo fitted) The brakes are terrible I know drum brakes are not great but surely they never made brakes like these when it was new ? I haven't had time to look at it yet but I would appreciate some advice what to look at? The pedal feels OK? No fluid leaking as I done 120 mile round trip keeping the vehicle a mile between the one in front just in case . I can only imagine dodgy slave cylinder but would that not make the brakes spongy which they are not ? Handbrake fine has free wheeling hubs if that means anything would appreciate a PM for what to do many thanks all