So while riding, I tapped the brake and could feel something change. Got off to inspect and found both front brakes dragging I assumed that my black rubber lines (yes those ones) had failed and I made the under a mile ride home. I figured I would just need new lines, flush ect. How ever after removing calipers on the front and pushing them in and purging some ugly looking fluid. I went to push bike into garage to go order lines, and noticed my back is dragging as well. So do these 2 separate systems just happen to fail at the same time or is there something I am missing. The ABS was just kicking in when I had tapped the brakes, but I read through my Clymer and I don't see how these could have anything to do with each other. Is this just 2 random failures at exactly the same time?
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Another R1100(RT) brake question
- Thread starter tmass
- Start date
happy wanderer
Day Dreaming ...
The newest 1100RT on the road is now over 19 years old. The rubber brake lines they used started failing about ten years ago IIRC. Since the front and rear circuits are seperate yeah, it's kinda random but not really. It's old age catching up.
Have you been flushing both the front and rear caliper circuits AND the two ABS circuits every year and no more than two years? If not they were done years ago and you are lucky you got this far without a brake lockup.
The fact that you have really dirty brake fluid in the calipers is pretty much all you need to know. The discolouration comes from decaying rubber brake components and seals.
I have not I have had it less than one year and already had them on the list to do. guess I should have done them first thing but been busy trying to fix the stuff that was having issues.
gsaddict
Pepperfool
You are lucky you did not crash.
That vintage of lines have been failing for quite a while now on F's,K's & R's
Symptoms:
Ballooning of line resulting in instant loss of brakes
Interior deterioration resulting in dragging/locked brakes & ABS module failure $$$
I've replaced dozens of sets.
I prefer Spiegler brand - make sure you specify if you have bar risers to allow for a longer front master line.
That vintage of lines have been failing for quite a while now on F's,K's & R's
Symptoms:
Ballooning of line resulting in instant loss of brakes
Interior deterioration resulting in dragging/locked brakes & ABS module failure $$$
I've replaced dozens of sets.
I prefer Spiegler brand - make sure you specify if you have bar risers to allow for a longer front master line.
Last edited:
I just ordered the set from Spiegler
So I have the new lines in place and was trying to get the brakes filled and bled. I am having trouble with the front system I believe I have the abs system bled well for the front. But the front wheel is still dragging I am going to try bleeding the front again. Any ideas? The calipers both moved freely and stopped dragging originally as soon as I removed the fluid and while I inspected them off the bike. used the "complete kit" to upgraded to braided.
gsaddict
Pepperfool
If a caliper drags after replacing the old rubber brake lines I would suspect a bit of rubber was left in that caliper and blocking the return flow.
I've seen it before.
Did you disassemble the calipers and clear of old fluid? Were there rubber bits in the old fluid?
tangoalpha
Member
Looks like it’s time to order a set of Spiegler’s. I highly recommend these. Best brake hoses you’ll find.
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
I thought it was temperature that changes the color of brake fluids??
I am not any expert. I have been informed that contrary to popular myth, brake fluid becomes dark when the brake fluid exceeds an certain temperature. Not wishing to start a fight, nor share my opinion versus yours, etc, do you have MC research to confirm your statement that it is the brake lines failing that makes them turn dark? The reason I ask is that under than premise, those who do not have rubber lines (I am told there are such things...braided stainless steel lines I think) would not ever see discolored fluid.
Please share any research that can explain that apparent contradiction, or correct my errors in assumptions. Thanks.
I am not any expert. I have been informed that contrary to popular myth, brake fluid becomes dark when the brake fluid exceeds an certain temperature. Not wishing to start a fight, nor share my opinion versus yours, etc, do you have MC research to confirm your statement that it is the brake lines failing that makes them turn dark? The reason I ask is that under than premise, those who do not have rubber lines (I am told there are such things...braided stainless steel lines I think) would not ever see discolored fluid.
Please share any research that can explain that apparent contradiction, or correct my errors in assumptions. Thanks.
pglaves
#13338
Because it is possible that several different causes may discolor the fluid. Debris may be one. Moisture may be one. Temperature may be one. I have some DOT 4 that has been opened.
pglaves
#13338
Teflon I think.
AntonLargiader
Active member
Brakes can also drag because the pads are very old and have been damaged by moisture.
gsaddict
Pepperfool
No, they are Teflon line. It is stronger than rubber, won't deteriorate and won't absorb water like rubber does.
See Spiegler link below. Newer BMW OE SS braided lines are Teflon as well.
https://spieglerusa.com/brakes/why-spiegler-brake-lines/line-construction.html
I have since disassembled the calipers and cleaned found zero debris and reassembled, I also did not find rubber debris in the system(anywhere), the one old line I cut open was cracking but not crazy bad like pictures I have seen online. I am going to try to clear each individual section of line/ equipment backwards to find the spot that is not letting pressure be released.
