06 GT Air in rear break line - BMW Luxury Touring Community
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post #1 of 3 Old Jan 21st, 2020, 1:10 pm Thread Starter
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06 GT Air in rear break line

Hi new to the site. I purchased a 06 K1200GT this winter and spent this weekend flushing breaks, changing engine oil and read final drive oil. Everything went relatively smoothly with the exception of 2 things.

One while trying to remove the connector on the ABS module the tiny plastic bar broke and makes it extremely difficult to engage the latch on the connector. Do they sell replaceable latches?

Second, and more important, I can't seem to bleed all the air out of the rear control circuit. I bleed the front control circuit, then front calipers, then rear calipers and finished with the rear control circuit. Order should not make a difference from what I read but just thought I'd share. It seemed like I was getting bubbles immediately so there's a possibility that there was air in the line already. The only thing I can think of is that I went past half way with the pedal as I was bleeding the system. I read in one of the write ups to avoid depressing the pedal past midway. I've pumped at least half a quart through the rear control circuit and I still get air bubbles. Does anyone have any suggestions on what to do or what I'm doing wrong?

Thanks for reading the post.

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post #2 of 3 Old Jan 22nd, 2020, 11:27 am
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Re: 06 GT Air in rear break line

Hey Kris, The rears can be a pain - same system on the LT. I have found that if you open the bleeders too far on the ABS it sucks air into it at the base. I pack a damp piece of paper towel a round the base of the bleeder as that helps ensure I only see bubbles from the ABS. The reason you don't want to go more than half way has nothing to do with air. You can push the piston past its normal travel area and there could be corrosion there since it never wipes that area.

I also use an elevated bleeder bag/line and just crack open the bleed nipple and pump away, no press - open - close - release. It makes it go a lot faster and air bubbles will not go down hill. Just make sure you never let the reservoir get too low or you suck air into the circuit.

As far as I know BMW does not sell a repair kit for that connector. Best bet is to find a used harness on e-bay - look for early years on GTs and any LT from 2002 on up will use the same connector. I may have one in the shop - I'll check and see if that part can be removed.

Just looked at the one I have and I don't see a way to get the slide part out of the housing without breaking it. This may be a tough one to fix.
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2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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Last edited by jzeiler; Jan 22nd, 2020 at 11:38 am.
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post #3 of 3 Old Jan 23rd, 2020, 8:22 am Thread Starter
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Re: 06 GT Air in rear break line

Thanks Jzeiler for the reply. You provided some really good info. I'm looking into a bleeder bag and I'll try wetting a paper towel with break fluid and putting around the bleeder to see if that eliminates the bubbles. No luck on ebay for the module connector but I'll keep searching. I think I can pry the tabs free inside the connector and swap out the old broken pieces. Would be easier to determine that with a connector not attached to the bike.
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