Not Enough Rear Brake Pedal - BMW Luxury Touring Community
 
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post #1 of 18 Old Jun 4th, 2013, 11:38 am Thread Starter
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Not Enough Rear Brake Pedal

After changing brake lines to new steel braided ones on my 05 LT and changing the fluid, I've only really started riding again because I've been dealing with a broken small toe that made wearing boots painful. Once I could put some miles on the bike, I've noticed that the brake pedal seems to go down further than I seem to remember. It doesn't rise when I pump the brakes, which is usually an indication that there is air in the line. All the fluids are at the proper levels and the brake pads for the rear have a decent amount of lining left. Everything seems to work OK, it's just that I have to push down a ways to engage it, rather than have it work sooner. Is this normal, or is there a way to adjust this?

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post #2 of 18 Old Jun 4th, 2013, 12:52 pm
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Re: Not Enough Rear Brake Pedal

It sounds like you might have a bit of air in the lines, flush it again. It should take care of the issue.

Courage doesn't always roar. Sometimes it is the quiet voice at the end of the day saying " I'll try again tomorrow".


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post #3 of 18 Old Jun 4th, 2013, 5:31 pm
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Re: Not Enough Rear Brake Pedal

+1 on that. I installed steel braided lines last year and had the same issue.

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post #4 of 18 Old Jun 4th, 2013, 7:38 pm
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Re: Not Enough Rear Brake Pedal

May even try emptying the reservoir and push fluid from the ABS tall bleed port (outboard) back to the reservoir. Use a syringe and see if that doesn't do it for you.

John
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
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But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 18 Old Jun 4th, 2013, 11:49 pm Thread Starter
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Re: Not Enough Rear Brake Pedal

Quote:
Originally Posted by jzeiler
May even try emptying the reservoir and push fluid from the ABS tall bleed port (outboard) back to the reservoir. Use a syringe and see if that doesn't do it for you.
How would that make any difference from the way you normally bleed the rear control circuit? What are the smaller bleed nipples for? There's four of them in all. They must do something.

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post #6 of 18 Old Jun 5th, 2013, 12:47 pm
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Re: Not Enough Rear Brake Pedal

Yes the proper BLEED sequence is port 1 then port 2 followed by port 3 and back to port 1 again. Here is the legend for the rear.

Pushing fluid from the unit back to the reservoir will sometime dislodge an air bubble. BMW fills the unit from the front caliper and a fill port on the side of the ABS at the factory.
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John
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
K4AN

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

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post #7 of 18 Old Jun 5th, 2013, 11:40 pm Thread Starter
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Re: Not Enough Rear Brake Pedal

Quote:
Originally Posted by jzeiler
Yes the proper BLEED sequence is port 1 then port 2 followed by port 3 and back to port 1 again. Here is the legend for the rear.

Pushing fluid from the unit back to the reservoir will sometime dislodge an air bubble. BMW fills the unit from the front caliper and a fill port on the side of the ABS at the factory.
Are all three of those bled by just using the foot switch? Are they all in the rear control circuit? I might need to do the front ones as well, just to be safe, as I replaced all the lines, even though I haven't noticed anything out of the ordinary there.. Do you have the sequence for those as well?

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post #8 of 18 Old Jun 6th, 2013, 1:07 pm
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Re: Not Enough Rear Brake Pedal

Yes these are just for bleeding the control circuit. Similar for the front. 1, 2, 3, and 1 again.

1 is the bleed screw, 2 is the integral port, and 3 is the metering port.
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John
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
K4AN

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; Jun 6th, 2013 at 1:12 pm.
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post #9 of 18 Old Jun 12th, 2013, 11:31 pm Thread Starter
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Re: Not Enough Rear Brake Pedal

Quote:
Originally Posted by jzeiler
May even try emptying the reservoir and push fluid from the ABS tall bleed port (outboard) back to the reservoir. Use a syringe and see if that doesn't do it for you.
I tried that and the fluid wouldn't go the other way back into the rear brake cylinder. I did try the other procedure, and I got some dirty fluid out of one of them, which was the number two port I believe, so unless you do this procedure, you are not doing a total fluid change apparently. I seem to have a little more pedal after this procedure though. The nipples are really hard to get at and get a wrench on however.

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post #10 of 18 Old Jun 13th, 2013, 1:08 pm
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Re: Not Enough Rear Brake Pedal

If you cannot push fluid back into the rear reservoir then the master cylinder is out of adjustment. Make sure that the pin that goes from the pedal into the MC has some free play (about 0.020"). Place a feeler gage between the stop bolt where the brake switch is and the brake pedal. Then loosen the lock nut and adjust rod until there is free play, then adjust out the free play and lock the lock nut and remove the feeler. You should then be able to push fluid back to the reservoir.


This being out of adustment would make a regular bleed hard to do as it was not opening up the return port on the MC.
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John
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
K4AN

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

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post #11 of 18 Old Jun 13th, 2013, 1:38 pm Thread Starter
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Re: Not Enough Rear Brake Pedal

Quote:
Originally Posted by jzeiler
If you cannot push fluid back into the rear reservoir then the master cylinder is out of adjustment. Make sure that the pin that goes from the pedal into the MC has some free play (about 0.020"). Place a feeler gage between the stop bolt where the brake switch is and the brake pedal. Then loosen the lock nut and adjust rod until there is free play, then adjust out the free play and lock the lock nut and remove the feeler. You should then be able to push fluid back to the reservoir.


This being out of adustment would make a regular bleed hard to do as it was not opening up the return port on the MC.
Where are you getting all this info and pictures? I'm not finding this in any of my manuals.

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post #12 of 18 Old Jun 13th, 2013, 2:38 pm
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Re: Not Enough Rear Brake Pedal

Quote:
Originally Posted by tonyn1
Where are you getting all this info and pictures? I'm not finding this in any of my manuals.
OEM shop manual, page 34.14 is what John is showing you, in addition to his expertise in wrenching on the LT motorbikes! Good luck, Tony.
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post #13 of 18 Old Jun 13th, 2013, 2:45 pm Thread Starter
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Re: Not Enough Rear Brake Pedal

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Originally Posted by Dick
OEM shop manual, page 34.14 is what John is showing you, in addition to his expertise in wrenching on the LT motorbikes! Good luck, Tony.
So where do I get one of those?

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post #14 of 18 Old Jun 13th, 2013, 5:35 pm
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Re: Not Enough Rear Brake Pedal

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Originally Posted by tonyn1
So where do I get one of those?
Your dealer can get you one. A little pricey - or you may be able to pick one up on Flea Bay or the classifieds here or on MOA - someone may no longer have an LT, butt still have a manual. You can also obtain a Clymers manual that a lotta folks use. Just google that and see what comes up.
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post #15 of 18 Old Jun 14th, 2013, 5:31 am Thread Starter
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Re: Not Enough Rear Brake Pedal

Quote:
Originally Posted by Dick
Your dealer can get you one. A little pricey - or you may be able to pick one up on Flea Bay or the classifieds here or on MOA - someone may no longer have an LT, butt still have a manual. You can also obtain a Clymers manual that a lotta folks use. Just google that and see what comes up.
I have the Clymers, and the manual on CD, but those don't have stuff in them like what John was able to tell me. I'll have to check around for one.

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post #16 of 18 Old Jun 14th, 2013, 10:08 am
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Re: Not Enough Rear Brake Pedal

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Originally Posted by tonyn1
I have the Clymers, and the manual on CD, but those don't have stuff in them like what John was able to tell me. I'll have to check around for one.

If you have the RepRom BMW CD it is in the "replace rear ABS master Cylinder" section.

What I had posted earlier was from the early PDF manual.

Here is a screen shot from the RepRom CD.
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John
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
K4AN

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

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post #17 of 18 Old Jun 28th, 2013, 9:08 am Thread Starter
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Re: Not Enough Rear Brake Pedal

Quote:
Originally Posted by jzeiler
If you have the RepRom BMW CD it is in the "replace rear ABS master Cylinder" section.

What I had posted earlier was from the early PDF manual.

Here is a screen shot from the RepRom CD.
Sorry I took so long to reply, but I just got back from a trip. How do I get one of those CDs?

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post #18 of 18 Old Jun 28th, 2013, 8:20 pm
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Re: Not Enough Rear Brake Pedal

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Originally Posted by tonyn1
Sorry I took so long to reply, but I just got back from a trip. How do I get one of those CDs?
I got mine from a dealer P/N 01790309672 but I just checked the parts list and it is no longer available. The Clymer manual is pretty good though. May find one on e-bay.

John
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
K4AN

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

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