Brake Problem

[SAV217]

Hi All, I'm new to the board and new to riding. I just picked up a '98 KX-125 and it has been running great for the last 3 months.. No problems. Last weekend while at the track I lost my rear brake. Now When I depress the rear lever I can hear air coming from the Master Cylinder. Is this supposed to be happening? I hadn't noticed it before but I haven't been getting real close to the rear MC whole braking either. From what I know of brake systems this does not sound good but before I start to tear everything apart I thought I would check with you all. In bleeding the brakes I have only been able to get a small amount of pressure to the caliper.

Thanks for the help in advance. This looks like a great group of people here.

 

[bedell99]

I'm going to give you the best advice I can. I owned a 99 kx125 and all I had ws problems with both brakes. You can either do 2 things. Send your brake to Dogtown Performance or new master cylinder off either a 2001 or 2002 kx. Don't even bother trying to rebuild it. Learn from my mistakes. It might cost you more now but in the long run you will save.

Erik

 

[WFO]

I'm not sure I'm reading you right. You hear AIR coming from the master cylinder? I know this sounds remedial, but did you just let your resevoir get low and then air got into the system?

 

[Reesknight]

Sounds like your hearing fluid blowing by the o-ring in the master cylinder.  Rebuild time or do what bedell99 says.