Motorcycle Classics

Honda CBX Master Cylinder Repair

Reader Contribution by Keith Fellenstein


Editor’s note: If you’re having trouble with that old Suzuki, BSA or BMW, Keith Fellenstein is your guy. From motorcycle tuning tips to detailed motorcycle engine repair, he can draw from a wealth of experience to help guide you to success. Send questions to: Keith’s Garage, Motorcycle Classics, 1503 SW 42nd St., Topeka, KS 66609, or send an e-mail with “Keith’s Garage” as the subject.

Q:  I’m working on a restoration and need to repair the master cylinder on this bike. The problem is the bike has been sitting since 2002, and the brake fluid is likely original. The bores are corroded and will probably not seal properly. Do you know anyone that can “bore” the plunger holes and fit an oversize plunger and seals? Any information will be helpful, thanks.
John Montes/via email

A:   If you have the cylinder bored, you’ll want to have it sleeved back to the original size. Increasing the bore size of the master cylinder will reduce the effectiveness of the hydraulic brake. There are sleeve kits available for several British bikes that reduce the bore size to increase the braking, but I don’t know of any companies offering this service for Hondas.


  • Published on Dec 6, 2017
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