This has been discussed but I am not sure if I can or should do this. I am installing a 60 series axle into my 73FJ 40 so I will now have disk brakes. I spent many months getting my FJ40 brake master to work with a 60 series booster for my old drum brakes ( and lots of money so I would hate to see it go right now) I also have a mini truck master (disk brake) that I could install in place of my 40 master that is on a shelf in the garage.. I need to get this project completed ASAP and I can install the mini master after a club trip in April. For now . . . Question: Can I keep the 40 master and remove the residual valve from the front line so the front disk brakes will work? If so, how do I do this and what else will I need to buy or figure out to match up to my stock brake lines.