rear brakes

[yfzracer220]

Has anyone had any rear brake problems. I lost my rear brakes completely at my last Southwick race. I think its the master cylinder, but I haven't looked at it yet. Just curious to see if anyone else has had this happen.

[4TraxRider]

My bud did. His are always spongy and seeem to come and go all the time, nomatter what I do for him. I've gone through 2 brake lines and countless bottles of fluid. Next step is the master cylinder, if you so yours first let me know if it works or not. Thanks.