Getting air in the brake system? - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 47 (permalink) Old 08-23-2006, 06:45 AM Thread Starter
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Getting air in the brake system?

I bled my front brakes, last, at least two years ago. Within the last 8-10 months the play or travel in the front brake lever has increased. I've been adjusting it, but now it's adjusted all the way out.

This morning I went to ride and the travel brought it almost all the way to the grip, only about a finger width away.

I popped the reservoir cap and noticed a couple of things. First, the fluid was not the same color throughout. There was a darker "cloud" floating around in there; no debris but a different color variation. Second, I started tapping the 3" line that runs into the reservoir and tiny air bubbles started coming out.

I knew there was air in the system and that was causing the sponginess and excessive lever travel, but it's getting worse.

Is my fluid breaking down? Do I need to replace the brake lines? What's going on? I may have to suspend riding until I can find time to fix this.
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post #2 of 47 (permalink) Old 08-23-2006, 06:47 AM
 
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I would swap out fluid and bleed. That probly will do the trick.



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post #3 of 47 (permalink) Old 08-23-2006, 07:08 AM
 
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And inspect the ends of the lines.. if it's the lines breaking down, it will be where they enter the fittings.
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post #4 of 47 (permalink) Old 08-23-2006, 07:31 AM
 
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And inspect the ends of the lines.. if it's the lines breaking down, it will be where they enter the fittings.
Yes...you might want to add some teflon tape to the bleeders and fittings to make sure they are sealed...

the different colored "cloud" leads me to think something has contaminated the fluid such as moisture. the last time you bled the brakes, did you add fluid? Was it the same fluid as before? I'm not talking about DOT #'s I'm talking label-on-the-bottle same...could be the fluid interacted with what was already there

Of course, the age of your bike suggests you should replace the lines and flush the systems...
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post #5 of 47 (permalink) Old 08-23-2006, 07:54 AM Thread Starter
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Yes, it's time for time maintenance...
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post #6 of 47 (permalink) Old 08-23-2006, 08:03 AM
 
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Yes, it's time for time maintenance...
Did you ever get that cam chain taken care of?



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post #7 of 47 (permalink) Old 08-23-2006, 11:09 AM
 
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I'd replace the brake fluid and lines to be safe. while you're at it, might be a good idea to clean any dirt out of the bottom of your brake reservoir too.
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post #8 of 47 (permalink) Old 08-23-2006, 12:00 PM
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Shan... I remember your problems with all of this...

Replace the lines. PERIOD

Heck replace everything... the lines, the pads, and the fluid. All of it.

I think you have some problems where the lines always go first... where the rubber meets the connectors at each end.

Just use your admin powers and get some lines for "review" ya that's it... review!




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post #9 of 47 (permalink) Old 08-23-2006, 12:11 PM
 
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Yes...you might want to add some teflon tape to the bleeders and fittings to make sure they are sealed...

the different colored "cloud" leads me to think something has contaminated the fluid such as moisture. the last time you bled the brakes, did you add fluid? Was it the same fluid as before? I'm not talking about DOT #'s I'm talking label-on-the-bottle same...could be the fluid interacted with what was already there

Of course, the age of your bike suggests you should replace the lines and flush the systems...
sUPPOSIBLY PUTTING A WRIDT BAND OR SOMETHING ON THE OUTSIDE OF THE RESERVOIR will prevent geting condensation/moisture into the fluid.

i would definately flush the lines and replace them with some SS lines. Inexpensive and a very good mod.
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post #10 of 47 (permalink) Old 08-23-2006, 12:41 PM
 
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I need SS lines dammit. And new rotors. $$$$$.



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post #11 of 47 (permalink) Old 08-23-2006, 01:00 PM Thread Starter
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Did you ever get that cam chain taken care of?


I don't have the time to do maintenance myself, and there are no good shops locally.
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post #12 of 47 (permalink) Old 08-23-2006, 01:51 PM
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Bring it to me and I'll do it!




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post #13 of 47 (permalink) Old 08-23-2006, 01:52 PM
 
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Bring it to me and I'll do it!
That's a hell of a trip.



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post #14 of 47 (permalink) Old 08-24-2006, 08:24 AM Thread Starter
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UPDATE!

Oddly enough, on my way home yesterday the brake feel returned to normal. In fact, I had to dial down the adjustment so it wouldn't "catch" so far away.

This makes no sense. And this morning, it feels the same way - no problems.

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post #15 of 47 (permalink) Old 08-24-2006, 08:31 AM
 
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UPDATE!

Oddly enough, on my way home yesterday the brake feel returned to normal. In fact, I had to dial down the adjustment so it wouldn't "catch" so far away.

This makes no sense. And this morning, it feels the same way - no problems.

Strange. Bleeding probly still not a bad idea.



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post #16 of 47 (permalink) Old 08-24-2006, 08:40 AM
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I would drain all brake fluid, flush the lines(or replace them), put in new brake fluid and bleed the lines. Get some speed bleeders, makes it so much easier.
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post #17 of 47 (permalink) Old 08-24-2006, 01:54 PM
 
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When I come through there in a coupla' weeks...I can bring the miteyvac and we can flush the system...better still...buy the lines and pads and we can swap out the system...

I'll be helping birdman rework his soon...so I'll practice on his to be ready for yours...
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post #18 of 47 (permalink) Old 08-24-2006, 02:33 PM
 
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I did that swap on my buddies last weekend. Shouldn't take too long. A few hours tops. Most of that time as you guys well know will be spent bleeding.



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post #19 of 47 (permalink) Old 08-24-2006, 02:40 PM
 
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Please make this a smiley.
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post #20 of 47 (permalink) Old 08-24-2006, 02:43 PM
 
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Please make this a smiley.
That is a good one. Great one actually. I stole it from Pucky.



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