HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
Thunderbug

Rear brake fade on the 650R??

7 posts in this topic

Was doing a really ratty jungle downhill where I was riding the rear brake pretty hard and the pedal went down to the footpeg.

A complete fade. I was expecting to see brake fluid all over the rear disc, but it was dry. Everything looked just fine.

We stopped for a bit of a break and when we took off again, no problems whatsoever. Whatever had caused it had stopped when the unit had time to cool off.

Anybody ever had this happen to them? Is there a cure?

Share this post


Link to post
Share on other sites

have you changed your brake fliuid lately? brake fluid absorbs water and that lowers the boiling point. under extreme use fluid basically boils causing the brakes to become soft or go away all together. I've exprienced this when when i ride supermoto and I"m hard on the brakes. As far as a cure you can try a steel braided line they don't expand as much as rubber so you get better braking power. but the best thing to do is change the brake fluid at regular intervals.

Share this post


Link to post
Share on other sites

Thanks 849, I was kinda suspecting something like this. I'll pump in some fresh juice.

Share this post


Link to post
Share on other sites

motul rbf600 dot 4 is what i use in my baja race bikes and you really have to abuse the rear brake to boil this stuff it works great

Share this post


Link to post
Share on other sites

Another thing is that the fluid gets very hot and the plastic brake lines get

soft and expand under pressure. Run some stainless steel braided lines for

zero expansion, that helps a lot also. I use Galfer brake lines, not too expensive

and they work great.... I did go back to the stock front break line though,

the steel one made the fron break too snatchy, I kinda like the "soft" feel

on the front.

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

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0