I am thinking of converting to disk in the front and already have power drum brakes, Can I just get the spindles, rotors and calipers etc and reuse my old power brakes booster , master cylinder, proportioning valve etc. Is there that much difference between those components from drum to disk?

Thanks
Ray

You do need a new master cylinder. The disc brake cylinders need more volume than drum brakes. You do need a proportioning valve. Drum/drum brake systems don't have one. Disc brakes need more pressure to achieve the same braking force, so that would cause the rears to lock up; befor the front discs even began to bite. Booster may have to be changed, depending on the master cylinder you get.

The braking system is a system of matched parts, not a collection of stuff. Talk to the folks at Master Power Brakes. www.mpbrakes.com Their combo packs are matched to your car and might save you a bit of cash over a trial-and-error approach to brake system design.

I'm in the same boat. I read couple of other posts and from what I gather so far, a new master cylinder is needed (70+ Nova, Monte..), and a combination valve.

Point I'm confused about is the combination valve...do some folks refer to these are proportioning valves? Also, where would you buy such valve from? standard auto parts store or specialty shop?

http://1967-81camarocarparts.com/catalogPDFs/F1%2005%20brakes.pdf

You could do a little homework on the parts you need and look locally to get the parts you need and most likely cheaper too.

Doug, thanks for the link.

pbedrosi-Point I'm confused about is the combination valve...do some folks refer to these are proportioning valves?
Here is a good article on the subject:
http://www.inlinetube.com/articles/Out%20of%20Proportion.htm

You can't use your drum/drum brake master cylinder - it has residual pressure valves in the outlet ports to maintain 10 psi in the system, and disc brakes don't use RPV's at all - you'll fry the disc pads and rotors if you use a drum brake master cylinder. :thumbsup: