Thread: How do you determine who's disc brake conversion you have?

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I am not done with the brakes yet. I got side tracked finding and installing a new 3rd member and now back to the brakes.

What I have for rear disc brakes:
"old" Calipers and new pads are 77 to 80 Lincoln Versailles and the new rotors I bought and drilled are 78 Lincoln Mark V.

I rented a tool from Autozone and attempted to screw the piston in. It would not budge so it's either froze or already bottomed out. With new pads installed and the piston fully seated I cannot get the new rotors to slide between the pads on either side.