Ducati Monster Forum

Moto Board => Tech => Topic started by: booger on February 17, 2026, 07:08:24 PM

Title: Are the radial clutch/brake masters for Monster S4RS rebuildable?
Post by: booger on February 17, 2026, 07:08:24 PM
I think I have a blown clutch master. I found a rebuild kit I think, at Gotham Cycles- 15mm. This got me thinking I might need to find a brake master kit as well to put away for when Brembo doesn't sell these anymore. But the brake master is reported to be 19mm per Google search. Can't find 19mm OEM Brembo brake master rebuild kits. Gotham seems to have everything and they don't have it. I think I might be operating on bad information. Are they really 16mm?

Does anybody know what is which with these vintage Brembo OEM radials??? Like what exactly are the bore and piston dimensions, what masters went on what bikes, etc. Are these anything like the 999 masters? Trying to find the correct parts and I'm confused.  ???
Title: Re: Are the radial clutch/brake masters for Monster S4RS rebuildable?
Post by: ducpainter on February 23, 2026, 04:48:42 AM
I don't know the size, but on most Brembo masters the bore diameter is cast/stamped/etched on the bottom near the banjo.
Title: Re: Are the radial clutch/brake masters for Monster S4RS rebuildable?
Post by: booger on February 24, 2026, 02:50:57 PM
Well I fudged around a little and found out. Ain't no rebuild kits for the brake master, period. One can rebuild literally ANY of the other brake masters that Ducati has ever used except for this one OEM radial brake master. Literally the clutch side has a Brembo kit available but the brake side? Nooooooooooooooooooooo.

Aye aye aye [bang]

I don't need a kit RIGHT NOW so I suppose its time to start saving up for RCS.
Title: Re: Are the radial clutch/brake masters for Monster S4RS rebuildable?
Post by: Howie on February 25, 2026, 10:27:02 AM
If you can open it and don't need a piston you can  probably match the seals.
Title: Re: Are the radial clutch/brake masters for Monster S4RS rebuildable?
Post by: booger on February 25, 2026, 01:27:23 PM
I was thinking about that too. And you know it just might work.  [thumbsup]