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

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FWIW - What you were told about the rotors being hubcentric and not relying on the bolt pattern to centralize them is 100% correct. The last rotors I redrilled actually had 17/32" hole in them from the factory. That's 1/32" larger than the 1/2" stud. At that rate, using the old rotors as a guide and just lining the center bore up will get you plenty close enough. As long as the center bore fits snug over hub and the studs go though the holes, you're good.

Originally Posted by Hotrod46

FWIW - What you were told about the rotors being hubcentric and not relying on the bolt pattern to centralize them is 100% correct. The last rotors I redrilled actually had 17/32" hole in them from the factory. That's 1/32" larger than the 1/2" stud. At that rate, using the old rotors as a guide and just lining the center bore up will get you plenty close enough. As long as the center bore fits snug over hub and the studs go though the holes, you're good.

I bought the 78 Lincoln Mark V rotors with 5 x 5" pattern. I bolted them hat to hat and used the old rotors as a guide. Studs on axles are 1/2 x 20 so I drilled the holes using a 9/16ths bit. All done and mounting them now. Writing it down for future reference.