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  #1  
Old 03-28-2016, 11:28 PM
08k1200gtmjg 08k1200gtmjg is offline
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2008 k12GT brake bleeding question

I'm a newbie so forgive the fopahs in posting etiquette. I want to change the fluid in my front and rear brakes. There are some great write ups and explanations for pre 2006 k12s but I haven't found any for 2006 and beyond.
My reprom (v5 2010) has a good explanation but the diagrams don't show my IABS controller which has no reservoirs or bleeders on the unit. Link below shows a pic of my controller compared to the RepRom controller.

http://imgur.com/a/GT0NV

Given all the posts I've read about problems with the ABS on these bikes, i'm a little intimidated...

My question is: Can I bleed these brakes using my trusty mighty vac just as i bleed the ABS brakes on my Volvo wagon? Any advise would be greatly appreciated. Thanks.
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  #2  
Old 03-29-2016, 01:00 PM
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Re: 2008 k12GT brake bleeding question

Bleed your brakes as you normally would. If you have a GS-911 it actuates the ABS and moves older fluid in there around, then you bleed again if you use it to help with bleeding. If you don't have one I suspect you could apply your brakes on a dirt road, induce ABS function, and then bleed again. There are no bleed points on the ABS unit nor are there reservoirs (wheel circuits).
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  #3  
Old 03-29-2016, 02:17 PM
RCU2WYO RCU2WYO is offline
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Re: 2008 k12GT brake bleeding question

Quote:
Originally Posted by Beech
Bleed your brakes as you normally would. If you have a GS-911 it actuates the ABS and moves older fluid in there around, then you bleed again if you use it to help with bleeding. If you don't have one I suspect you could apply your brakes on a dirt road, induce ABS function, and then bleed again. There are no bleed points on the ABS unit nor are there reservoirs (wheel circuits).


Beech is correct - I just pulled my ABS Module and of course no 'definitive' process in RepRom in brake bleed or removal of the pump.... I used a brake bleed suction unit and I know guys that like speed bleeders that have a ball check in the nipple... Others use bleed bags - and a simple clear plastic hose in a water bottle with a bit of brake fluid works too..

Ultimately, I performed the steps below to bleed - haven't got the ABS pump back yet, but will follow these steps till no air in line.... As Beech says, you can activate the ABS by doing some hard practice braking to cycle the pump - then do a quick bleed again -- if don't have a GS911...

Steps:
- Siphon old fluid from brake fluid reservoir with syringe
- Fill fluid reservoir with fresh Dot4 fluid
- Bleed front caliper nearest hand brake lever - pump hold lever & bleed until clean fluid is observed -
- Fill fluid reservoir with fresh Dot4 fluid
- Bleed opposite side front brake - pump lever & bleed till clear
- Fill fluid reservoir with fresh Dot4 fluid.

Rear is the same - brake fluid reservoir under passenger seat....

Hope that helps....

-Stephen
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Old 03-29-2016, 09:09 PM
08k1200gtmjg 08k1200gtmjg is offline
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Re: 2008 k12GT brake bleeding question

Awesome...Thanks all, very much for your common sense direction. I've bled a lot of car/truck and motorcycle brakes but I had a "ruh roh" moment when the "factory directions" didn't match ground truth (my bike!). Thanks again.
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Old 03-30-2016, 01:51 AM
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Re: 2008 k12GT brake bleeding question

Having just finished fixing my i-ABS2 system (the usual motor brush sticking problem) which entailed partial disassembly of the ABS system, I can verify that bleeding the system in the "normal" way is all that is needed. I did use the routine on my GS-911 to flush out old fluid from the ABS passages, but this made no difference to the operation of the system.

One thing that is important... if you use a vacuum bleeder, then you must finish it off with manual bleeding. Vacuum bleeders leave a small amount of air next to the bleeder screw.
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Old 03-30-2016, 01:56 PM
RCU2WYO RCU2WYO is offline
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Re: 2008 k12GT brake bleeding question

Thanks RFW - good to know, the brake vacuum tool is nice - but not at all necessary.... IMO.
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