I posted this in the accessories board as a specific question and did not get any responce, so I figured I would try it as a more general question here. I am looking at upgrading to radial master cylinders on my monster. Are there a difference in diameter on the ABS equipped bikes vs the non ABS equipped bikes?
I have a 796ABS and put radial masters from a 1198 on it with zero issue.
Doesn't REALLY answer your question though. I think there are dimensional differences between the coffins and the radials that alter the control/feel of the pull of the levers. To the best of my knowledge, there is no difference between say a coffin from a 696 and a coffin from a 796ABS.
The 796ABS has a squishier feel than my 696 did simply because of the system having more volume and components to move the oil through. That being said, putting the radials on it didnt do much at first, but after I finally got all the air bled out of it, front brake has a lot better feel. Clutch is better too.
One thing worthy of mention if your doing a swap at all...the lines mount with the banjo horizontal on coffins, vertical on radials...i had enough slack in my lines to make it work, but it was certainly a WTF moment when i first looked at it.
Thanks for the info on that. I was worried due to the extra fliud volume that they would go for a larger diameter master cylinder for the ABS bikes.
Well keep in mind, from an engineering standpoint, brake fluid is incompressible. So assuming the ABS portion of the system is passive (when you squeeze the brake your not actually moving anything in the ABS module), then then the volume of fluid that you displace by squeezing the brake lever, is the same volume that moves the pads. When ABS kicks in, its really just blocking the flow of fluid from your master (and through piston movement allowing a slight pressure drop on the caliper) making the brakes grab less.
If you can follow it, this sketch actually illustrates it fairly well (car system, but similar principle applies)
(http://web.mit.edu/2.972/www/reports/anti_lock_brakes/anti_lock_brakes-1.gif)