85 Front Brake YZ85

[jackson409]

Need some help on this one. Front brake just stopped working on our last ride. I got home removed the Master cylinder cap and the fluid looked really dirty, almost black so I unhooked the bottom line at the caliper and drained the fluid. I blew out the line to get it all out. I then saw some little black particles in the Master clyinder so I took it apart and cleaned it. Filled it all back up and bled the crap out if it until nothing but nice clean fluid comes out. I still can't get any brake at the lever. If I squezz really fast and hard I get brake but then if I let go and squezz again...nothing. is the caliper or the master cylinder it just seems like the fluid is bypassing something somewhere.

 

[SRAD97750]

The master cylinder has o-rings that can break down and make the fluid black. It also leaves o-ring particles in the fluid.
Once these o-rings are gone or half deteriorated, the pumping action is bypassed. I bet a rebuild kit will set you straight.
-BIG DAN

 

[SRAD97750]

http://www.ebay.com/itm/MOOSE-MASTE...Parts_Accessories&hash=item20d297738c&vxp=mtr
Or this kick ass option.
http://www.ebay.com/itm/Yamaha-YZ-Y...Parts_Accessories&hash=item1c33257502&vxp=mtr
-BIG DAN

 

[Mojavekid18]

Master cylinder, like dan said. Same thing happened on my KX after i took a spill on it the first year i had it

 

[jackson409]

Alright, cool. I will get a rebuild kit and go from there.

 

[Mihylo33]

Yeah what those guys said Dugan....

 

[jackson409]

Yeah what those guys said Dugan....

day late and dollar short shine

 

[timoyz]

MILFs to do.

 

[jackson409]

So its fixed Front master cylinder rebuild kit did the trick. Thanks guys and you to Mike

 

[Mihylo33]

So its fixed Front master cylinder rebuild kit did the trick. Thanks guys and you to Mike

j/k... I lurves Momma Jax.... not to be confused with Mrs Jax... I lurves her too but in a special kind of short bus way..