Disk Brake Conversion for '62 Classic

63 or 64 Classic master cylinder will fit, and has the ports on the correct side but it will only use two of the four mounting locations on the 62 Classic.   I don't know if it will have enough fluid capacity for the recommended Scarebird calipers though.   Joe 

Ok then it sounds as if I'm dealing with a car thats been modified as this already has the dual resevoir master on it, and only uses 2 of the 4 holes on the firewall. Both front and rear port labels are cast into it, and has #28883 cast as well.

Edited by AfterhoursFab - May/09/2012 at 11:17am

Right, and they used a Wagner master cylinder that has a screw in the center of the cap to hold it down. One of the brake lines uses a big flare nut with a small line to prevent mixing front and rear. When you switch to a newer master cylinder that line will have to go. Don't cut the end and flare it, just disconnect the line at the junction block and get a new one close to the same length from the parts store. You may still need an adapter at the master cylinder though. Parts store should have one. 

If the master cylinder you have is for drum brakes then yes, it can be used. Pull the residual pressure valve out of the front brake outlet. All AMC/Rambler drum brakes use a 1" bore MC and the GM calipers that Scarebird uses also require a 1" MC.

If it's for disc brakes it depends on what disc brake system it was made for. Technically you can use it even if the bore is bigger than 1", but it won't deliver quite as much pressure as a 1" bore MC would. So it will take a "little more leg" for the brakes. That might not be an issue for you, so try it anyway. It will stop good regardless. 2.6" piston Bendix (77+ small cars) and the GM calipers use a 1" MC, all others used a slightly larger bore MC (1-1/16" or 1-1/8"), 

I have had to tap the brake very lightly to get the valve out, but most of the time they just come out. If the front brakes drag a bit the valve is still in there, if not you're fine. Disc brake master cylinders usually have a large reservoir for the front brakes, a smaller one for the rear. Not necessary, they were made that way (most late model ones aren't)to "idiot proof" the system -- never check the fluid and there's still enough in the front section to last the life of the pads.

When you say "pulled the brass" I assume that's the tube seat with the little hole in the center of an inverted cone? If not that's why you didn't find the valve. That's probably what you pulled out though...