I am currently looking to upgrade my front brakes to discs and was wondering about the master cylinder, I know I need to get one to accomodate the discs, but do you know if it has to be set up for disc front-drum rear or can it just be a disc master cylinder? Thanks

 

You'll need one that matches your system, like disk/drum, or disk/disk. The drum brake masters have a check valve to keep the shoes out to the drum, the disk brakes don't. You can also use a slide hammer to pull the valve out of your existing master, but they usually don't have enough volume for the disk calipers.

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Texlurch - 68 Camaro-LT1 w/Hot Cam, TT & TIC coming soon!
" a little spray never hurt anyone, spank you very much!"
or the old standby:"I came here to race, not sell real estate. You ain't scared, is ya?"

 

I thought the check valve (also called residual pressure valve) was in the distribution block (or proportioning block) not the Master cylinder.

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69 Camaro among other toys.