I just hung some new disks brakes on my 74(original not after market) new ball joints and the whole smear. I was not planning on using the power brake booster that came with the parts I bought. Can I use the master cyl that was being used for the drum brakes or do I need to use the master cyl off of the booster that came with the disk set up. I have been in some things where you needed different pressure for front disks and drums. I am not sure if the old master cyl will work without changing the proportioning stuff or not. To let you know I did get a complete front brake set up off of another 74 nova. Was not planning on power brakes just disks, but I could go to power if I had to. All info is greatly appreciated.