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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: primetimespacetime on August 17, 2026, 05:16:28 PM
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Ok so preamble as short as possible with the most info.
Trying to figure out if I can reasonably swap out the ABS 1 on my 94 K75 for ABS 2.
The simple parts seem to be the pump/sensors/sensor rings/brake lines.
The hard part (and possibly impossible) The electronics.
Would it be doable to splice in the ABS 2 ECU and wiring harness into the Main ECU of the K75?
Is there another better route?
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Longer explanation and backstory for those interested (Not necessary to read but ads context)
I picked up a "deflowered" k75 that someone had started a cafe project on and abandoned.
The frame has already been slightly modified and parts etc are missing.
I know to some the cafe racer rebuild is an abomination to original classic bikes, but I figure I'm safe from those opinions as this one is already pretty far gone.
I'm planing on doing a scrambler/adventure bike build with it.
I've already got GS spoked wheels as well as modern WP adventure forks.
I'd love to throw some modern radial callipers like Brembo m4's on the front (should work as the total piston area is only 6% different between the m4's and the ABS 2 equipped bikes).
This is actually the main reason for this rabbit hole. Going the modern radial calliper route vs adapting older axial callipers to the new forks.
The extra bonus would be the saved weight/space and better performance.
Anyway tell me I'm crazy but I wanna do it so if there's a way I'd like to figure it out.
Thanks in advance to all who contribute.
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I believe your question can be answered by analyzing the ABS1 and ABS2 diagrams provided by Motobrick member frankenduck at his site. The drawing for ABS1 is at this link (https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/kwiring/K100/K75.K100.ABS.Wiring.SLP.V1.0.pdf), and the diagram for ABS2 can be found following the table of contents at this link (https://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/kwiring/K1100RS.94on/K1100RS.94on.Wiring.SLP.V2.5.pdf).
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Laitch this is supremely helpful. Thank you. I have a line on a donor r1100rt. I know there is some talk about the ABS 2 units being hard coded to the model they are installed on. For that reason I'm trying to source all the parts from one bike rather than piecing together ebay listing.
Do you (or anyone else) have a link to the r1100 wiring like the previous k1100 one?
Or is it exactly the same I know the physical layout of components is slightly different.
I tried the kbikeparts website but it just goes to a broken homepage
Thanks again
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Answered my own question Laitch, found this website https://car-diagrams.jimdofree.com/bmw/motorcycle/ Hope it can help someone in the future.
Obviously still happy to have other chime in with valuable knowledge or experience.
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The extra bonus would be the saved weight/space and better performance.
Obviously still happy to have other chime in with valuable knowledge or experience.
If the intended goal is actually create an adventure/scrambler and save weight in the process, removing the entire ABS system—this rider/fabricator (https://motobrick.com/index.php?topic=14999.0) was ok with not having it at all—would eliminate ≥20lbs. It seems to get him everywhere he wants to go. Those old ABS systems can have a steep learning curve for navigating downhill grades on loose gravel.
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ptsp, if you still need R series wiring I have access to pre-2007 BMW wiring diagrams. if you pm me the last 7 of the vin I can send you a pdf of the wiring.
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Laitch, thanks for the advice. I'd like to keep it if possible for any around town daily riding. I actually was hoping I could figure out a way to include a shutoff switch for any adventuring.
Scott, I really appreciate it. I think I have all the diagrams I need now. If I run into anything I'm missing I'll be sure to PM you. Now it's just about figuring everything out. So if anyone has any advice have at.
Thanks again both of you.