ABS connections - BMW Luxury Touring Community
 
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post #1 of 19 Old Jun 3rd, 2009, 7:40 pm Thread Starter
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ABS connections

I received my rebuilt ABS unit this afternoon. I got it installed and started to make the steel brake line connections. I thought the rear brake inside connection was threading awfully easy until I realized it was only slipping into the hole. Large hole, small fitting. I checked the rear outside connection. Small hole, large fitting. I felt like the ABS unit was different when I pulled it out of the box. I told my wife it wasn't the one I sent in. Of course, it's not. The rebuilder told me they didn't do any exchanges on these units. Mine must have gotten swapped with another one. I checked the shop manual and this ABS unit is correct, as to the size of the connections. From left side of bike, both sets of connections have the smaller fitting on the left and the larger on the right. My lines have small fitting on the left for the front and small fitting on the right for the rear. Figures!

Anybody with ABSII care to check your connections and let me know how yours are configured? I'm going to have to remove this unit and send it back. &#(*&^#$!!!

Lee
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post #2 of 19 Old Jun 5th, 2009, 5:36 pm Thread Starter
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Re: ABS connections

Didn't anybody with a '99, '00, or maybe an '01 have time to look at the ABS unit and let me know the fitting size configuration for the rear brakes?

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
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post #3 of 19 Old Jun 5th, 2009, 10:37 pm
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Re: ABS connections

Lee:
Don't have the plastic off, but it looks like the farthest forward fitting should be small, #2 heading aft is large. Of the aft two fittings, the larger one appears to be on the outside and the smaller on the inside.

If I remember right from when I was attempting to purge/clean the ABS pistons (which didn't work by the way), the front two are the front brake circuit and the aft two are the rear brake circuit.

The Clymer manual has a pretty good picture of the brake line attachments to the ABS on page 491 which seems to agree with my install (2000 model)

Good luck!

Jim H.
K1200LT '00 for Touring, '73 Norton for fun
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post #4 of 19 Old Jun 6th, 2009, 6:24 am Thread Starter
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Re: ABS connections

Thanks for the reply, Jim. That confirms what I believed to be the case for the ABS unit I started with.

The unit I have now is stamped 06-03-00. This may make the unit fit an '01. Can anyone with an '01, please check the sizes of the fittings and let me know what you see?

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
2005 K1200 LT Ocean Blue
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post #5 of 19 Old Jun 6th, 2009, 10:08 pm Thread Starter
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Re: ABS connections

I picked up a second set of steel brake lines. Their configuration matched the ones on my LT. I decided that with the second set, I didn't have anything to lose, so I bent and twisted the used set to fit the ABS controller. A quick bleed of the rear lines and the rear tire would stop spinning when the pedal was pushed. So far, so good. Got the front connected and bled. Tank and seat installed. I reset the ABS and the lights are flashing together. I couldn't stand the suspense of not knowing if the lights would go out, so I took her out naked. The lights went out and stayed out. I'll have to go out for a good long ride to make sure everything stays fixed.

There has been a bunch of fluid run through the front brake circuit and still the lever is soft and will go to the grip when pressed. Subsequent squeezes build a little pressure each time, but the lever is still pretty soft. I'm not getting any bubbles at the calipers or the ABS unit. Fittings are all tight, no leaks anywhere. Spiegler's SS lines were installed while the LT was down. The lever was soft the last time the ABS unit was out, but not this soft. It firmed up after a few miles of riding. This time I'm a little concerned about the stopping situation or lack thereof. Anybody know what's causing the soft lever?

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
2005 K1200 LT Ocean Blue
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post #6 of 19 Old Jun 7th, 2009, 5:59 am
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Re: ABS connections

I have seen that before on the early bikes, usually the old flex lines but have replaced them. Did you get any air out of the ABS unit bleeder? It is a high point and could have air in it. Other wise bleed that circuit till it hurts!

John
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post #7 of 19 Old Jun 7th, 2009, 9:05 am
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Re: ABS connections

Have heard that air bubbles can sometimes lodge in stagnant areas within fittings and be difficult to purge. It was recommended to me (by someone associated with ABS systems on aircraft) to rap on the fittings lightly with a screwdriver handle while purging (although you will probably need an extra hand). Don't know if this actually does anything, but it's cheap to try. The other alternative is that the master cylinder piston is leaking internally, but I haven't seen much evidence of that in this forum.

Jim H.
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post #8 of 19 Old Jun 7th, 2009, 4:36 pm Thread Starter
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Re: ABS connections

John,
We pushed fluid through every opening we could find. Plenty of air in the system, but we bled until there was no more. I intended to do some more bleeding this afternoon, but my son had a birthday party to go to and my wife isn't good around people. I might take another crack at it in a bit.

Jim,
I had never thought about rapping the fitting, but it sure can't hurt. I'll try it. Thanks

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
2005 K1200 LT Ocean Blue
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SS1000 - September 2009
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post #9 of 19 Old Jun 7th, 2009, 8:57 pm
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Re: ABS connections

Lee,

It is unacceptable that you should have to go through this when you paid a (supposedly) reputable rebuilder to rebuild YOUR unit. IMO, you should NOT be forced to settle for this. They should find out where the mix up is and correct it ASAP. Somewhere out there, another poor unfortunate soul is probably wondering what the heck happened to the unit HE sent to them!

Jack Homesley
Cornelius, NC USA
'06 Goldwing - "The Black Pearl"
Too many others to list...


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post #10 of 19 Old Jun 7th, 2009, 9:44 pm
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Re: ABS connections

Say, Lee510, I'm not sure if this will do you any good but, I once forced brake fluid thru the bleed screw and up to the brake reservoir (opposite the normal bleed direction) on a 62 apache truck. It was the only way I could get the air out of that system.

I bought a gallon of fluid and a 1 gallon garden sprayer, then adapted the hose fittings.
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post #11 of 19 Old Jun 7th, 2009, 9:53 pm Thread Starter
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Re: ABS connections

Quote:
Originally Posted by cccpastorjack
Lee,

It is unacceptable that you should have to go through this when you paid a (supposedly) reputable rebuilder to rebuild YOUR unit. IMO, you should NOT be forced to settle for this. They should find out where the mix up is and correct it ASAP. Somewhere out there, another poor unfortunate soul is probably wondering what the heck happened to the unit HE sent to them!
Swapping my unit for a different unit was what I asked for in the first place. Connections being screwy weren't part of the equation. Hadn't thought of that. When this unit arrived, I knew by looking at it that it wasn't the one I sent in. I called the rebuilder about the connections and told them the unit I had wasn't mine and that some person somewhere would be having the same problems I was in reverse. They told me they had just replaced my unit with another. Since this unit is working and I still have a warranty, I'm going to let it ride. It is what I asked for, after all.

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
2005 K1200 LT Ocean Blue
ATGATT
CCR 2009, CCR 2010, CCR 2012
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SS1000 - September 2009
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post #12 of 19 Old Jun 7th, 2009, 9:58 pm Thread Starter
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Re: ABS connections

[QUOTE=seahabit]Say, Lee510, I'm not sure if this will do you any good but, I once forced brake fluid thru the bleed screw and up to the brake reservoir (opposite the normal bleed direction) on a 62 apache truck. It was the only way I could get the air out of that system.
[QUOTE]
Thanks, Tom. Seems like I read a bleeding procedure here somewhere on doing that, maybe with a Mighty-Vac?

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
2005 K1200 LT Ocean Blue
ATGATT
CCR 2009, CCR 2010, CCR 2012
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SS1000 - September 2009
BB1500 - September 2009
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post #13 of 19 Old Jun 8th, 2009, 5:40 pm
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Re: ABS connections

Where did you get a rebuilt ABS unit and how much did it cost? I have a 2000 and my ABS needs to be replaced, and I don't want to spend 2100 in parts and whatever for labor to have them replaced new on a bike that isn't worth $6500 when the brakes are working.
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post #14 of 19 Old Jun 8th, 2009, 9:26 pm Thread Starter
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Re: ABS connections

James,
The rebuilder is Auto and Truck Electronics, Rogersville, TN, www.autoecu.com They rebuild lots of electronic components, but BMW ABS units aren't their specialty. Parts take time to get and they could have your unit for a month or more. This was my second attempt at rebuild and I guess the one I had was beyond repair. They sent me a replacement, but it isn't for an LT. The unit appears to function, but the front brake lever is still soft, even after riding 15-20 miles. Last time, riding caused it to firm up. Then, there is the problem with the rear wheel locking on hard stops from 20 miles per hour. Not only does the wheel lock, but releasing the pedal does not cause it to roll freely. The unit I have installed, does not cause ABS to activate.

I made a call Sat. evening to A&S BMW in CA to ask about this ABS unit. Since they're on Pacific Time they're open late on the east coast. The tech, Tim, called me back Sunday afternoon. He told me all ABSII LTs have small, large, large, small fittings and since the one I have wasn't configured that way, it wasn't for an LT and wouldn't work. By this time, I had already installed the unit and decided to try it anyway. It doesn't work, as Tim had said.

I will call Auto & Truck Electronics tomorrow morning. The customer service dept. has been good to work with. I know they'll make it right.

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
2005 K1200 LT Ocean Blue
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SS1000 - September 2009
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post #15 of 19 Old Jun 8th, 2009, 9:35 pm
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Re: ABS connections

AAAAARRRRRRRRRRRGGGGGGGGGGGGG!!!!!!!!!!!!!!!!!!!!! !


Jack Homesley
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post #16 of 19 Old Jun 8th, 2009, 11:12 pm
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Re: ABS connections

does anyone have a used unit that lee could put in his bike... surely there is at least 1 member here who has an old unit sitting on a shelf somewhere gathering dust..
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post #17 of 19 Old Jun 9th, 2009, 11:58 am
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Re: ABS connections

How about two used units? One for me and One for him???
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post #18 of 19 Old Jun 10th, 2009, 9:27 pm
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Re: ABS connections

Quote:
Originally Posted by sheldan2
does anyone have a used unit that lee could put in his bike... surely there is at least 1 member here who has an old unit sitting on a shelf somewhere gathering dust..

I'll sell him a good, used GT!

Jack Homesley
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post #19 of 19 Old Jun 10th, 2009, 9:35 pm Thread Starter
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Re: ABS connections

Did you get the Virago running? You gonna ride it to CCR?

Lee
Y2K K1200 LT Canyon Red - Torn apart by a Bimmer 11-10-10. Sold to Saddleman to be reanimated.
2005 K1200 LT Ocean Blue
ATGATT
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SS1000 - September 2009
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