70 olds master cylnder
#2
At a minimum, flush the system out, but frankly a new M/C is cheap and you have to bleed the brakes anyway, so you MIGHTASWELL...
#3
I just went through the same thing... I thought about doing a MC rebuild because the original reman for my 62 was sort of expensive. I ended up deciding that I was better off replacing all of the hydraulic components and switching to a dual-pot master. Then, after I replaced all the hydraulic components, I decided that those old lines were just going to release grunge into my new hydraulic parts, so I ripped out all of the lines and replaced them too.
If the only difference between a near-total rebuild like you're describing and a total rebuild is doing the lines, then I'd think about doing the lines too. FWIW I just finished using the "NiCopp" brand of nickel-copper-steel alloy lines to do total rebuilds on two cars and it was a very pleasant experience -- that's a sharp contrast to all the unpleasant experiences I've had with steel lines.
If the only difference between a near-total rebuild like you're describing and a total rebuild is doing the lines, then I'd think about doing the lines too. FWIW I just finished using the "NiCopp" brand of nickel-copper-steel alloy lines to do total rebuilds on two cars and it was a very pleasant experience -- that's a sharp contrast to all the unpleasant experiences I've had with steel lines.
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