Kelsey Hayes Style Rear Brake Master Cylinder with 5/8in. Bore - Chrome. Fits FX 1980-1983, FXWG 1980-1982 & Sportster 1980-1981.

Features & Benefits:-

* Replaces OEM # 42415-79C

* 5/8" bore for great multi-piston calipers.

* Rebuild Kit # BAI-17-0035AC-RB

Tech Tip:-

* Brake Line Options.

* Brake olive can be removed from the existing master cylinder & refitted to new master cylinder which then requires 3/8" UNF flare nut fitting # GOO-P6150-03CH and re-use the factory brake line.

* Use 10mm banjo bolt # GOO-P775-03CH, 10mm banjo & universal brake line.