i just picked up a brake master cylinder & booster from my local junkyard, it's the 15/16 one and the booster is NM230V-3. i also picked up the proportioning valve, just to keep everything the same. in my crx(88dx) i have the si rear disc brakes, which i'll be changing back to drums(88-89 hf drum rears). my question is will i have any problems using this brake master cylinder & booster? should i use the ex proportioning valve, eventhough i'm going to use dx brakes? thankx in advance for your input!