Dual disk MC
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Road Warrior
Joined: May 2010
Posts: 1,718
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From: Bay area, CA
Cool good to know thanks!
Good info thank you! The RK was dual disk and I believe were also 2 piston calipers but I don't know about the size of the Pistons. I know Harley changed to "Brembo" in '08 and the calipers changed but I don't know specifics about piston sizes. Worst case scenario I'll have to buy the correct MC down the road but it sounds like odelay hasn't had any issues. This conversion can add up when your running mags so since I already have the MC off one of my old bikes I'd like to try and save $120 if I could
Master cylinder plunger diameter is determined largely by total caliper piston diameters. Assuming the RK you used for the donor MC has dual calipers of the same piston count and diameter as your bike, you will be fine. If not, you'll want to consider the implications. The biggest effect is pedal/lever force required to actuate the brakes.
All I had to do when I put them on my '01 FXDXT (which already runs the 11/16" MC) was thoroughly flush all the DOT5 out of the system with denatured alcohol. (discussed in a few posts here).
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