Master Cylinder

Putting manual brakes on a '76 Duster in place of power brakes. Question is, will the power brake master cylinder the car currently has work for manual brakes? I've done power to manual brakes before, but I've bought the master cylinder for the pushrod I was using. Or do I need to buy a manual brake master cylinder? Seems to be a debate. I don't want a debate, I want facts. If there is a better option, please say what make and model of car should I use? Some say B-body manual disc brake car. Will the one on the car work, and is there a better option. Thanks.
P.S. my pushrod is from a '68 barracuda

Well, try the master cyl you have on the car now, it's free you have nothing to lose by trying. If you wind up with too hard of a pedal then put a smaller bore master on it or if you have too much travel (assuming the rears are adjusted right) then you'll need a larger bore master.

All you need to convert from power to manual brakes on that car is a manual brake pushrod or an adjustable pushrod that can be adjusted to manual length. Make sure to plug the vacuum line that runs to the booster after it's removed.

Brad4406 said:

All you need to convert from power to manual brakes on that car is a manual brake pushrod or an adjustable pushrod that can be adjusted to manual length. Make sure to plug the vacuum line that runs to the booster after it's removed.

Click to expand...

thanks, I will use the master cylinder I have. Power brake master cylinders are the smaller diameter, which should make for easier pushing, maybe a little further travel. Haven't tried to re-use the master cylinder before, but I will on this one. Oh, yes, I will plug the vacuum..... lol

318willrun said:

... Power brake master cylinders are the smaller diameter, which should make for easier pushing ...

Click to expand...

Correct.

Best to use a new rubber bushing which attaches to the groove on the end of a manual brake rod. It keeps the rod from popping out of the MC piston (or rattling). If the MC piston jams in the bore (from rust), the rod could conceivably extract enough that you couldn't push the piston again. Since those bushings are hard to find alone, I think some people have cut rubber hose or used an O-ring.