Putting An ABSII Front End On A Standard ST1100

Well, I took her for a short road test (with all of the body work stripped off) just to see how she stopped in the 'real world'. No problem at coming to an 'orderly' stop from 70 mph (of course I tested at lower speeds first ;)). Quite an improvement from the standard 'stoppers' which was what I was hoping for. If I really got serious, the nose would squat with a decent squeeze of the lever. I wasn't about to grab a handful as I am pretty sure the front would have locked up. So the ABSII brakes on a standard ST1100 can be done with all ST1100 parts (except for a three way junction) but it ain't a job for the faint hearted or easily discouraged. It does require having the entire hydraulic ABSII system as I used hoses, lines and brackets from other parts of the system to get the lengths needed. I did have to 'rebend' one steel line to get the curves right for the front and used an after market three-way junction (the only non-ST1100 part) to connected the front lines from each side and the master cylinder. On the back, I used the double ABSII banjo bolt so I could run both lines to the master cylinder. I'll post some pictures when I get the chance.
 
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Well, I finally got the rest of the 'rehab' (new auxiliary wiring, body work and exhaust repair) done on Redbird and rode her to work today.
It was a WAD (working as designed) and she stopped beautifully with little effort on the front lever - which was what I was after.
According to my 'butt' dynamo, she stops a lot quicker and lot easier now, however YEMV. :biggrin:
I've just got to get those pictures posted.
 
So glad that worked. That and it sounds like your leg is working well too. Thanks for sharing.
 
Some pictures finally -
 

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  • STD To ABS Triple Tree Junction Bottom.jpg
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After some discussion with Mr. Heath about his fluid movement calculations, I decided to swap the front ABSII master cylinder back to the standard one just to see how it felt. Now the lever travel and pull is almost identical to the ABSII models (using the butt dynamo again). Brakes still work fine as they did before, but the lever 'feels' better to me. So if any crazy person decides to do this, I will highly recommend keeping the standard front master cylinder. I also suspect, now that I pulled it off and looked at it, that the ABSII master cylinder may have been a bit 'dodgy' anyway.
 
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