Jump to content

Yamaha 2005 XT125R front brake not holding pressure. Please help!


UglierBoss
 Share

Recommended Posts

Hi there so my ongoing project with the XTR has one thing left the front brake. When I got the bike the brake would build up pressure and then overnight would lose it again. I cant see any liquid dripping out of the caliper so i assumed that was ok and bought a master cylinder kit. Now my boy who the bike is for gets impatient and says let me take the bike into work and I'll get it fixed in my lunches. fast forward a month or two and it comes back to me with no work done at all but in the kit for the master cylinder there is now a ball bearing which I dont remember taking out of anywhere, is the ball a one way valve that I've overlooked. Ive checked the service manual and theres no balls anywhere.

Ok so Ive put the new master cylinder in and i can get most of the air out of the system, but then the brake fluid comes out of the reservoir instead of moving the caliper. Parts for this bike are hard to find (discontinued) so could i replace the whole lot with a generic kit? 

Any help gratefully appreciated. :)

Link to comment
Share on other sites

I would,,  thers  some good master cylinders on  ebay,,even repro   rd ,, or  K/h ,,    will do, 

Link to comment
Share on other sites

Link to comment
Share on other sites

Thanks for the help guys, I have replaced the master cylinder so thats better. I think the caliper has a leak/crack because fluid isnt coming out the bleed nipple itself, but the thread of the nipple. I may have to replace the caliper. I have found one on ebay in italy but it looks worse than the one i have so probably not worth it. can I get a different caliper for this bike? maybe off a YBR or something, although its on the wrong side so i dont know. Once again, any help gratefully appreciated!

Link to comment
Share on other sites

3 hours ago, UglierBoss said:

I think the caliper has a leak/crack because fluid isnt coming out the bleed nipple itself, but the thread of the nipple.

Woah, woah, woah, woah..!

Chances are that if you had a cracked calliper, you'd know about it!
It sounds to me like your bleed nipple is blocked.
It's fairly normal for air/fluid to come out of the threads...

1/ Don't crack it open quite as far, it's only supposed to be cracked enough to let air out then nipped up again quick.

2/ Buy a new bleed nipple (I'm pretty sure they all have the same threads on them...).

 

Out of curiosity, how are you bleeding the brakes?

Are you:

a/ Doing it the old fashioned way and using the lever?

b/ Using a vacuum bleeder?

c/ Using a pressure bleeder?

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Who's Online (See full list)

    There are no registered users currently online

  • Recently Browsing

    No registered users viewing this page.

×
×
  • Create New...