00 WR400F...no brake pressure

5 replies to this topic
  • wadejjet

Posted February 26, 2009 - 02:05 PM


I have a 2000 WR400F that's giving me front brake issues. I can bleed them all day long but I can't ever build any pressure. Not sure what my problem is because there definitely is not a leak anywhere so i'm not sure if this is caused by a bad seal or some number of other things.

Any suggestions would be greatly appreciated. Thanks.

  • chaindriven

Posted February 26, 2009 - 02:20 PM


sounds like you have air in the line. did you make sure the reservoir did not empty when filling the line? if you had a leak in the system you would see fluid.

  • wadejjet

Posted February 26, 2009 - 02:23 PM


Yea i've still got fluid but i'm thinking I maybe still just have some air that i'm not getting out by bleeding them the regular way. I just read a post about removing the caliber from the front wheel and holding it above the master cylinder level and bleeding it like normal...so maybe that'll do the trick. We'll see though...thanks.

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  • TallBoysWRF

Posted September 04, 2009 - 08:13 AM


Did you ever get it figured out? I'm having the same problem with my '99.

  • mrlopez

Posted September 04, 2009 - 08:54 AM


use a vacuum pump that should solve the problem

  • pablo83

Posted September 06, 2009 - 07:27 PM


The front brake line runs higher than the reservior which makes it have to bleed. The vacuum pump will help a lot. Another option is the remove the handlebars and raise the reservior above the brake line while bleeding.

If these steps don't work then you probably have a bad master cylinder, replace it.


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