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I have a Corvette-style master brake cylinder on my Speedster. I want to replace it with a non-painted aluminum billet unit to eliminate the problem with the dissolving of the paint from the resevior lid. I do not know the diameter of the cylinder bore and do not have the original part number of the unit. Can I determine the cylinder diameter by just pulling the unit away from the power booster and measuring the diameter of the cylinder with dial calipers, or do I have to pull the piston out?
 

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I have a Corvette-style master brake cylinder on my Speedster. I want to replace it with a non-painted aluminum billet unit to eliminate the problem with the dissolving of the paint from the resevior lid. I do not know the diameter of the cylinder bore and do not have the original part number of the unit. Can I determine the cylinder diameter by just pulling the unit away from the power booster and measuring the diameter of the cylinder with dial calipers, or do I have to pull the piston out?
That is exactly how you do it. Just measure the bore at the back of the M/C.

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