Bigger brakes for S3 SWB ute
My 1972 swb had brakes that wouldn't have stopped a kid's trike on flat ground. I rebuilt the original equipment completely without any significant improvement. I then fitted the 12" x 3" front brakes from a 6 cylinder, replaced the pipes without all the odd LR bends that make them impossible to bleed and fitted a master cylinder with a booster. The brakes are now actually better than my '96 Defender.
I have a vacuum pump solution. They are available from the USA quite cheaply from (don't laugh, this is real) miamiambulance.com This mob do spares for the large Ford ambulances, as well as prosthetics, drugs and parts for your X-Ray machine if required. They do a belt drive oil-less pump that just needs Land Rover ingenuity to fit a bracket and a pulley to and off you go.
Best of luck!