Master Cylinder ID

[Tmwoodall]

I am not sure why, but I have two master cylinders. I can't for the life of me remember why we put the smaller on (perhaps it mated to the stainless lines, and the larger didn't?).

Can you fellas help me ID these two and what I should be running on a 72 with disc fronts (soon to be disc rears)?

[Livrat]

The one attached to the booster looks to be a drum brake master, The single one is a disc brake master.. but I can not tell if it is for a 1/2 ton or 3/4 ton without looking at the plunger/piston depth on the back.

[jocko]

they both look like drum brake masters to me - (as opposed to disk/drum) because the reservoirs appear (by looking at the lids, anyway) to be the same size (front res vs rear res on each individual mc). The one on the right COULD be disk/disk (which would also have same-size reservoirs front to back), but only vettes and some rare camaros had them from the factory, so that would pay more dividends on ebay.

The one on the left kind looks like a 67-ish drum/drum mc to me.

just a thought.

[Tmwoodall]

Originally Posted by jocko

they both look like drum brake masters to me - (as opposed to disk/drum) because the reservoirs appear (by looking at the lids, anyway) to be the same size (front res vs rear res on each individual mc). The one on the right COULD be disk/disk (which would also have same-size reservoirs front to back), but only vettes and some rare camaros had them from the factory, so that would pay more dividends on ebay.

The one on the left kind looks like a 67-ish drum/drum mc to me.

just a thought.

Both cylinders are the same size, on both resevoirs.

I was thinking about just starting fresh and getting a new booster and master cylinder just to be safe. I paused on the project many years ago and some of the details have escaped me.