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Old 12-07-2006, 10:49 AM   #1
Motomech OP
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Location: Playas del Cocos, Costa Rica
Oddometer: 337
Dual disc frt. brk., would this work?

Ok, I've been looking at the two parts bikes in my carport and wondering if I couldn't use two stock right fork legs, two stock rotors and two stock calipers to make a dual disc frt. brk. Everything is symetical and looks like it would bolt up ok, the lower fork leg on the left side being turned around to have a trailing caliper, as opposed to the original leading caliper. But there is the problem of the master cyl., master cyl.s for dual disc set-ups have a different hydraulic ratio. Any sugestions for a BMW dual disc master cyl. that would be suitable to use on a GS?
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Old 12-07-2006, 01:40 PM   #2
datchew
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There was someone in a thread a few months ago that showed pictures of having done that very thing.

http://www.advrider.com/forums/showt...=brake+upgrade

*edit* Found it!
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Old 12-07-2006, 01:52 PM   #3
R-dubb
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Having recently wrestled with the same issue, I decided against it. One very simple issue is you will have a hard time finding a caliper. They are not reversible. The similar dual disk, Brembo calipers that BMW used during this period have a smaller piston. (I have a pair, and a pair of matching rotors with four holes that fit the GS hub if you are interested.)

The primary reason I decided against it is unsprung weight. It adds quite a bit. It is more efficient (and easier)to upgrade to a four (or six) pot caliper and a larger rotor. I actually could have pulled off the dual disk set-up more easily since my HPN forks have mounting tabs already on both sides! Still decided to go the upgraded single disk route.
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Old 12-08-2006, 06:04 AM   #4
Motomech OP
Adventurer in Latin Amer.
 
Joined: Dec 2005
Location: Playas del Cocos, Costa Rica
Oddometer: 337
Thanks for link. I can see I could only use the lower fork legs and would have to scrounge everything else. Yes I agree, better to use one of the more common brk. up-grades.
Thanks
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Motomech "One modification a day"
'92 BMW R100GS Bumblebee
'91 Suzuki TS 200R
'96 KTM 300EXC
Playas del Locos


"The BMW Airheads, riding yesterday's technology the day after tomorrow".
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