BMW Luxury Touring Community banner

1 - 9 of 9 Posts

·
Premium Member
Joined
·
3,151 Posts
Discussion Starter #1 (Edited)
Well since seeing brake fluid under my bike from rear pads going low, then me pushing the pistons in.

So I knew I needed to pull the ABS covers on the pots and visually check.

Well I pulled the rear panel which is all of five minuets pop the rear cover and it looked full. Really know surprise there as the caps of the front and rear ABS covers have a Y to a vent tube.

Well I thought I have a funnel I bought and unboxed it. Nice unit. The I saw the frame rail and remembered someone here said about cutting it and putting a clear piece of tube on it to work it into the tight fit. Did that and used a rat tail file to deburr it then a sharp blade and finally wash and a hair dryer to get it dry.

So I screw on the cap of the funnel to the ABS unit rear pot, attached a Mighty Vac brake hose with ball valve line only, filled the funnel, opened the rear outside brake fitting, turned the bike on and hit the rear brake pedal. Hmmm brown fluid, keep the funnel half full and clear comes out eventually. Clear past the ball valve, turn the valve off, turn the bleed screw closed, and repeat on the other rear bleed screw.

Did exactly the same on the fronts, same "dirty" to clear transitions.

So put it all together, and get ready for a ride.

Check I have brakes as others here have warned many times, I do.

Back it off the lift down a very slight grade to the street.

I hold my breath click first and a couple of revolutions and the brake light on the dash goes out and I still have brakes!

So 60 Mlle ride and bring her back home and it still has brakes.

So throw the GS911 on it to check the new software and it is all Griff said and showed it was. Hey no codes, and all looks good.

I guess that part of the LT brake flush is demystified for me now.

If I would have known how to get the two reservoirs empty I would have done that also.

Anyone have a "simple" explanation? Bunch of nipples up on that ABS unit?

I am just happy I have brakes and since I have a 07 I was happy to push a bunch of new fluid through that ABS unit, and still have brakes. While not brown, the fluid was dirty.

Just looking to protect that expensive ABS unit.

Total time about 45 minuets.

Baby steps............

going after the clutch fluid next. Here tell that is a gravity bleed?
 

·
Premium Member
2011 R1200RT
Joined
·
8,175 Posts
The 05 and later have 2 independent circuits and there are that many nipples on the ABS unit for that reason. You only replaced the brake fluid on the wheel circuit but you did not replaced the fluid in the control circuit.
Take a look at John Zeiler's document for a better understanding of your brakes system
 

·
Premium Member
Joined
·
3,151 Posts
Discussion Starter #3 (Edited)
zippy_gg said:
The 05 and later have 2 independent circuits and there are that many nipples on the ABS unit for that reason. You only replaced the brake fluid on the wheel circuit but you did not replaced the fluid in the control circuit.
Take a look at John Zeiler's document for a better understanding of your brakes system
Thank you.

Yep was pretty sure that is what I had done, just the wheel circuits.

Still dirty though :rotf:

I think it was I had that BB.com funnel sitting around, and I got to mod it a bit, new tool and all that :D

After I get through my Summer trip I want to either muddle through it, or see if someone 100 miles or so around would help me get through it in a Tech Session.

Not hard to get to the unit at all so no big deal in my book. I don't think I wasted anything, or hurt anything as the 911 showed. Did I mention it was dirty? I just need to get to that ABS unit after seeing what I saw today.

Only 2 years old too.
 

·
Wrencher Extraordinaire
2005 K1200LT
Joined
·
14,347 Posts
Lee,


Great Job. That was me that used the tubing to make the funnel more user friendly. Now about all those nipples on the ABS unit. They are 1 - the front metering cylinder; 2 - front integral circuit; and 3 - front control circuit (the pic on the left). And the same setup for the rear (pic on the right). These you do the old fashioned way, pump and hold - open bleeder, close bleeder and pump and hold. All with the key OFF. Use a 7mm wrench and to make some of them more accessable just pop off the ABS unit electrical connector. Stick a flat blade screwdriver in the slot on the "domed" end of the connector and work it out board. It will unlatch and lift the plug.

The correct sequence is 1, 2, 3 and 1 again. This is more critical for a bleed if air has been introduce and less so for a flush. I get most of the bad fluid out on #1 and very small amounts out of #2 and #3. Also I would only recommend doing the "other half" once every three years as I got pretty good fluid out after two years. But then I did one at STC in the Smokies and the front control circuit was pretty black. Just adjust for moisture content in your location.
 

Attachments

·
Premium Member
Joined
·
3,151 Posts
Discussion Starter #5
Thank you John.

I love your posts as you pretty much give what a person asks for.

After reading all the documents I have, I just wanted an easy to follow procedure 1,2,3,and 1 again is just what I wanted, and asked for.

Only difference I see is on my 07 it looks like the #2 are very long on my ABS unit. I will have to look tonight to be sure but it makes little difference in the procedure.

I think I will go after these tonight and see if I can blow something up.

I assume keeping the tube a bit higher then the bleed screw and the tube full will minimize the risk of air entering the system?

Also assume to baster out the front and rear reservoirs and fill with fresh to start to minimize the times one must open and close the bleeder screws?

Also I assume all three of these circuits feed from their perspective front/rear reservoirs?

Thank you again making something that is rather confusing to me anyway, way easier. I just do not need to know the specific function of each circuit, just how to get them serviced.
 

·
Wrencher Extraordinaire
2005 K1200LT
Joined
·
14,347 Posts
Yes on all your assumtions. The picture is dead verticle, which is misleading, yes those are very long nipples. Another tip on the front reservoir, there are two holes that feed the piston. The tiny little bugger will squirt fluid much further than one would expect. I lay a dull box cutter blade in the reservoir to cover that dirty little hole, don't forget to remove it.

The book has you remove the switch gear and loosen the handle bar clamp to level the reservoir. Not absolutley necessary but I usually do it, Clean the rubber gasket and only fill to the little notch on the marker.
 

·
Premium Member
Joined
·
3,151 Posts
Discussion Starter #7
John and all just wanted to follow up on this.

I did them 1,2, and 3 front and rear and no issues at all.

Well not quite, my hose was a bit too big so I did make a mess pulling them off each nipple. Need to get the right size hose in another 2 years :)

I can see the need for a bent wrench. I got it done and worked VERY gently on each fitting. I will get someone to cut and weld me a 7MM.

Ran about two reservoirs and then a top off on each, front and rear. While not dark brown it was brown at every bleed point.

I now have piece of mind. Being an 07 and I do not know the date of birth off the top of my head, I felt I was due anyway.

I will put it on the GS-911 tomorrow after some miles but feel confident with no wig wags on the dash, and it stops me all is well.

John I cant thank you enough for your help!!!!!!!

Following your pictures it was really a very easy task.

Well my 16 year old son did all the squeezing and pushing on the pedal and handle so he may disagree :D
 

·
Wrencher Extraordinaire
2005 K1200LT
Joined
·
14,347 Posts
Hey, Glad to help Lee. After all "it is what we do", to quote John Spencer.
 

·
Premium Member
Joined
·
3,151 Posts
Discussion Starter #9
Re: 1/2 A Brake Flush?/+ 1/2=Done

Thanks to John, and this Forum I can put this to bed.

NO faults on the GS-911 after 100 miles or so.

I am concerned on the rears going in 13,000 miles. They were EBC's, on the EBC rotor just not sure of the composition?

Also after looking at notes I see when I replaced my front tire and was cleaning the calipers I popped it out. That is when I threw a wig wag on the Dash. I filled only the Front reservoir of the ABS unit to make it go away at that time.

So with Pads down to all but backing plate, I never did get a Wig Wag from them as I had original implied.

Need to watch reservoirs more closely.

I watch the clutch reservoir like a Hawk!

Anyway the funnel from BeemerBoneYard, a bit of tubing, and the two pictures posted here by John showing sequence, it is a very doable project.

Ohhh and if you have not reached in the wallet for this forum, go ahead and do it NOW :D , seriously you cant buy a Magazine subscription with this amount of knowledge in one place even for 100,000,000 ;)

Thanks to all, again!
 
1 - 9 of 9 Posts
Top