Dual Front Discs on Fatboy : V-Twin Forum: Harley Davidson Forums

wamnram · 09-30-2009, 01:40 PM

I am thinking of putting dual front disc brakes on my fatboy. Has anyone done this? I have an 06 fatboy with factory spoke wheels and single front disc, all stock. Haven't seen a right fork leg that would allow it so wasn't sure it could be done.

Thanks,

Wayne

Mac4020 · 10-01-2009, 06:11 PM

You would most likely have to swap the sliders out for a set from a touring bike with the same diameter axle. You may run into issues with axle length and spacing, but if the fork tubes are the same distance apart as the touring bikes, you should be able to use everything from the touring lineup.

ktwillys · 10-01-2009, 10:40 PM

you have to swap the sliders for a touring type that has the dual disc slider....
then you have to use the HD (or aftermarket but the HD ones work the best and are fairly inexpensive) FatBoy fender adapters...
the biggest part is your wheel... it has to be able to accept the dual brake rotors... most if not all FatBoy wheels do not do this...
as for the axle size .....
you can get a wheel with the correct axle size or you can just change out the bearings.. the sealed bearings all have the same OD (outside diameter) but the ID (inside diameter) is different.. so you can put whichever size bearing you need to fit your axle..

but if you are going to go that far you might as well use the HD brembo's..

all the same except you add brembo rotors and calipers..

easy as pie...

wamnram · 10-02-2009, 07:50 AM

Thanks! I really appreciate the info.

Wayne

BK Meyers · 10-02-2009, 08:26 AM

I am thinking you would also need to change your front master cylinder to one that is designed for a dual disc set-up to ensure proper fluid pressure and lever feel.

BK

ktwillys · 10-02-2009, 08:55 AM

Quote:

Originally Posted by BK Meyers

I am thinking you would also need to change your front master cylinder to one that is designed for a dual disc set-up to ensure proper fluid pressure and lever feel.

BK

It does work a little better but you can get away with it not being the larger bore master... your lever moves further but will still work..

but then the larger bore masters are very easy to find and are pretty cheap....
I got one just recently for my sons bike and paid 15 bucks for it as a new take off..