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I believe the power unit lines are the same size are non power masters. The nut is 9/16; I was looking for the thread size so I could buy "caps" to block the lines when changing calipers.
Hi Greg,
I have some small soft red plastic caps that were on the brake lines I've bought.
The large size is 1/2" inside dia., and the small size is 5/16" inside dia. .
I BELIEVE the 5/16" is what's at the caliper too.
Regards,
Alan