Hi All

        I need a little help here , my ride is a 1985 FXEF Superglide it has a single disc front brake, What I need to know is the master cylinder bore measurement for a single disc and also a twin disc setup , any help would be great Thanks Steve

Single is 9/16, Twin is 5/8

Thanks for hhat Walka , Will a 5/8" master work with a single disc setup ???

For dual calipers also 11/16" Part number #45105-05AI.but the new Brembo's are a smaller bore.

hi,   single disc is 5/16" & also 9/16" can work  but the bigger 1 will give you a harder lever , depends if it's a 4 spot or a 1  spot caliper  11/16' is for twin disc