Front brake line burst - things to look for. - BMW Luxury Touring Community
 
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post #1 of 11 Old Apr 13th, 2014, 9:02 am Thread Starter
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Front brake line burst - things to look for.

While I have the bike apart for service, I was wondering if there is any tell-tale signs of the front brake line is getting closer to failure and should be replaced?

They both feel fine and are flexible, I dont see any cracks although one is bent more than the other.

Currently riding a 2003 K1200LTC
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post #2 of 11 Old Apr 13th, 2014, 9:22 am
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Re: Front brake line burst - things to look for.

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Originally Posted by timgray View Post
While I have the bike apart for service, I was wondering if there is any tell-tale signs of the front brake line is getting closer to failure and should be replaced?

They both feel fine and are flexible, I dont see any cracks although one is bent more than the other.
Age. If 10 or more years old, replace for sure. 7-10 is a judgement call. Mine turn 7 this year so I am starting to look at Spiegler and other options.

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post #3 of 11 Old Apr 13th, 2014, 9:40 am
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Re: Front brake line burst - things to look for.

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Originally Posted by timgray View Post
While I have the bike apart for service, I was wondering if there is any tell-tale signs of the front brake line is getting closer to failure and should be replaced?

They both feel fine and are flexible, I dont see any cracks although one is bent more than the other.
If either of the short pieces of brake hose are bent in a U shape rather than straight, you are near failure. That bent line shouldn't be. Eventually, it will burst.

'15 GTLE


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post #4 of 11 Old Apr 13th, 2014, 9:55 am
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Re: Front brake line burst - things to look for.

Brake lines are not something to leave unchanged. Change them now. you are overdue

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post #5 of 11 Old Apr 13th, 2014, 10:27 am
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Re: Front brake line burst - things to look for.

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Brake lines are not something to leave unchanged. Change them now. you are overdue
Plus 1
Better to do it with the bike already apart.

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post #6 of 11 Old Apr 13th, 2014, 11:46 am Thread Starter
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Re: Front brake line burst - things to look for.

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If either of the short pieces of brake hose are bent in a U shape rather than straight, you are near failure. That bent line shouldn't be. Eventually, it will burst.
This right here needs to be in a "Things you MUST look for" document in the Tech section.

I am assuming they are stock as none of the PO documents show that they were ever replaced and one of them has a slight U shape to it as can be seen in the photo.

Ordering replacements right now.

Anything to watch for in replacing them? tricks to make replacing them and then flushing easier so I dont get air in the system?
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Currently riding a 2003 K1200LTC
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post #7 of 11 Old Apr 13th, 2014, 12:17 pm
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Re: Front brake line burst - things to look for.

Oh if you replace a line you will get air in the system. There are some tips to keep the amount of air that actually gets to the ABS unit to a minimum. On the control circuits you want to push fluid (syringe and hose) from the ABS bleed port up to the reservoir, rather than the other way around for a flush. This will minimize the amount of air introduced into the unit. Run the fluid down to the end of the hose before you put it on the bleed port.

The wheel circuits are a piece of cake. You start out with full reservoirs and you then push fluid out to the calipers with the pump. Just keep the reservoirs full and once you get some fluid at the caliper, you can use a long hose from there back to the reservoir and pump until the hose is free of bubbles.

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post #8 of 11 Old Apr 13th, 2014, 12:24 pm
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Re: Front brake line burst - things to look for.

I was stubborn and just replaced one at a time until I had done four of them. Order the Spieglers and be done with it. When replacing the front lines, break the system open where the master cylinder line enters the hard lines on the steering head. This will allow you to drain the master cylinder line and caliper lines without getting air into the ABS unit.


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post #9 of 11 Old Apr 13th, 2014, 12:31 pm
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Re: Front brake line burst - things to look for.

Quote:
Originally Posted by timgray View Post
This right here needs to be in a "Things you MUST look for" document in the Tech section.

I am assuming they are stock as none of the PO documents show that they were ever replaced and one of them has a slight U shape to it as can be seen in the photo.

Ordering replacements right now.

Anything to watch for in replacing them? tricks to make replacing them and then flushing easier so I dont get air in the system?
Search for Spiegler install by Scouter-50. I got tons of great advise from everyone. Saddleman told me about cutting down a 6mm hex key so that nothing major had to be removed from the handlebars and Dean Woolsey told me the proper order to remove the hoses. I don't know how to link that post to this one so all I can say is search. It was not a difficult job to complete, just a little time consuming.


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Last edited by Scouter-50; Apr 13th, 2014 at 12:31 pm. Reason: additional info
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post #10 of 11 Old Apr 13th, 2014, 12:46 pm
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Re: Front brake line burst - things to look for.

Quote:
Originally Posted by timgray View Post
While I have the bike apart for service, I was wondering if there is any tell-tale signs of the front brake line is getting closer to failure and should be replaced?

They both feel fine and are flexible, I dont see any cracks although one is bent more than the other.
Tim,
I just had one burst on my 2002 .... no obvious signs of cracking or deterioration...
like others have said, your probably overdue.

if your gonna replace the entire brake line sytem, start on a friday and don't plan on getting done until sunday....

seriously, it's a maze.
but not impossible... just time consuming.

True Wisdom Only Comes From Pain.


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post #11 of 11 Old Apr 13th, 2014, 2:42 pm
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Re: Front brake line burst - things to look for.

I just had a right front line failure on my 05. Replacing with new technology material at a much lower cost than BMW of course. A local company in Northridge is making custom hydraulic lines for the LT for West Valley Cycle BMW, the cost is comparable to Spiegler but I will get the lines in a couple of days. Based on the feedback I read on this forum I ordered the BMW copper washers for the banjo connections. Then of course I will not only bleed but also flush the entire system while I am there, using John Z's video . The clutch was bled a few months ago when I replaced the clutch and slave cylinder.

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