Jump to content
Sign in to follow this  

Brake Bleeding Not Worked

Recommended Posts

I read a very good post on here on how to bleed the brakes properly as I wasn't that impressed with mine. I removed the wheels, pushed and held the pistons in with clamps, wrapped the bleed nipples in thick PTFE tape and then used a large syringe to push fluid up through each system.

The front brake seems okay, although I think the pads need changing. The 1994 YZ125 I owned had a really effective front brake much more so than this WR450, although that could also be because of the weight of the YZ125, but I think it could be that the pads have glazed over.

When I did the back brake though it didn't work. When I now apply the back brake the piston does not move at all and there is no resistance. Was I supposed to apply the back break during the bleeding process or something. I would imagine that there is air somehow trapped behind the plunger but I don't understand what I have missed here. I thought reverse bleeding it would solve this problem.

 

 

Share this post


Link to post
Share on other sites

Did you rebuild the back brake?  I went through a couple of renditions of this until I figured out my rear piston was slightly scored.  You could barely see it (I did not the first time.  I polisthed with 2000 grit and problem solved

Share this post


Link to post
Share on other sites

No I didn't rebuild the brakes at all. The only thing that I was a little concerned about was that I used a clamp to push the piston in and hold it there while I bleed the brakes but I was concerned I tightened the clamp too much and maybe the piston has got stuck. However, I thought that would still cause the brake pedal to have resistance and make it try and push the caliper piston back out.

Share this post


Link to post
Share on other sites

I decided to have one last go at bleeding before doing anything more drastic. I tried using the syringe to vacuum the fluid through rather than back bleed and I found a large amount of air got pulled through and out the system so this then sorted the problem and the rear brake works now.

Thanks

Edited by Snow Drift
  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×
×
  • Create New...