03-05-2012, 01:55 PM | #1 |
Join Date: Jan 2012
Location: El Dorado, Kansas
Posts: 83
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Front brake problems
Hey i have a 2007 komoto 250 i just replaced my steering neck bearings but in the process when i did that i disconnected my front brake cable and when i reassembled everything and i bleed the front brake and get all the air out with a mityvac brake bleeder and i do acouple manual bleeds i cant get my front brake to get any pressure built up so i rebuild the master cylinder and and rebleed the system and still nothing and its starting to piss me off :( anyone have any solutions or can help for me?
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03-05-2012, 02:13 PM | #2 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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If it was working before you must have air in the system still I think.
I also use the vac and it usually works but since air rises and you're 'pulling' fluid from below try what we do to bleed airplane brakes. PUMP the fluid from the bleeder nipple out the master cylinder. I bet this will restore function.
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03-05-2012, 03:15 PM | #3 |
Join Date: Jan 2012
Location: El Dorado, Kansas
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ok ill give that a try
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03-06-2012, 01:56 PM | #4 |
Join Date: Jan 2012
Location: El Dorado, Kansas
Posts: 83
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well i tried reverse bleed it like you said and still nothing i pumped a whole bottle through the system and still nothing some how i royally screwed up the front brakes
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03-06-2012, 01:58 PM | #5 |
Join Date: Jan 2012
Location: El Dorado, Kansas
Posts: 83
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could the rubber boot in the master cylinder be a problem? maybe its not sealing and getting the pressure built up? idk...
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03-07-2012, 12:02 AM | #6 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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If that was the case, you'd think that the master would leak. The good news is that entire assemblies (including the master, lever, hose and caliper) can be had for cheap on eBay.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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03-07-2012, 12:45 AM | #7 |
Join Date: Mar 2012
Location: Chilliwack BC, Canada
Posts: 32
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The air is probably trapped in the front caliper.
Take the lid off the master cylinder remove the caliper from the fork, and make sure the portion where the hose attatches is pointing UP. remove the brake pads from the caliper and while the hose is oriented so the air can escape, push the caliper back in with a C clamp or some channel lock pliers. this will force all fluid and air from the caliper. (keep bleeder nipple closed on the caliper, keep an eye on the master cylinder for overflowing when you push the caliper back) once this is done, put the pads back in and re-attatch the caliper. you can then pump the master until the caliper fills with fluid, make sure to keep the master filled while pumping the caliper. |
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03-07-2012, 12:53 AM | #8 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Never thought of that. I wonder if it's helpful to remove the caliper bolts (leaving the hose attached), turn the caliper upside down and then right side up again. Maybe air got trapped where it can't get out via normal bleeding.
It works for gassy infants.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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03-07-2012, 01:03 AM | #9 |
Join Date: Mar 2012
Location: Chilliwack BC, Canada
Posts: 32
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This is a common fix on the old CB400's, yank off the caliper and push it back. Same idea for cars with stubborn/stuck bleeders.
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03-07-2012, 01:06 PM | #10 |
Join Date: Jan 2012
Location: El Dorado, Kansas
Posts: 83
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ok coool yea i give that a try and see what it does i hope this fixes it thanks for the help
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03-07-2012, 02:12 PM | #11 |
Join Date: Jan 2012
Location: El Dorado, Kansas
Posts: 83
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YAY!!! ok brake is fixed now. THANKS!!!!!! a bunch everyone for your help im so relieved now that it is taken care of..
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03-07-2012, 02:33 PM | #12 |
Join Date: Mar 2009
Location: Southeastern Washington desert
Posts: 14,761
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Great news.
I'll tell you what some people here really know things! :P
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03-07-2012, 02:45 PM | #13 |
Join Date: Jan 2012
Location: El Dorado, Kansas
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LOL that they do and im glad i can come here and get that awesome knowledge and wisdom!
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03-07-2012, 09:22 PM | #14 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Azriel_Strife came up with that one. Awesome tip!
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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03-07-2012, 10:06 PM | #15 |
Join Date: Mar 2012
Location: Chilliwack BC, Canada
Posts: 32
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Haha, thanks guys. saw this a lot on the old CB400's, the same can happen to any disc brake system, particularly front ones.
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