Posts
1138
Joined
9/15/2008
Location
Shelby, NC
US
user760a
9/14/2015 7:39pm
9/14/2015 7:39pm
Edited Date/Time
9/15/2015 6:35pm
I really dont drag the brake too much, but I do use it to kind of stabilize the bike through a lot of corners. It gets extremely hot and at that point,. even the lightest application of rear brake results in a chirp and lock situation. It is impossible to modulate the brake when it is that hot: its either no brake or chirp and lock the wheel. This is the story on a MX track- the other day in a two hour hare scramble with six laps of a nine mile course that has about 350 turns a lap (so it seems) I did not even make it through one lap before the brake was so hot it was all or nothing. It is impossible to flow when your rear brake is constantly locking
I have lowered the pedal (a lot) to avoid unintended brake drag. Have changed the brake fluid (just replaced with the standard dot 5) , and have even ground two quarter inch vertical grooves in my pads to aid cooling and lower friction a bit..all to no avail
has anyone had this problem? any tips? I am wondering if lower friction pads, extra insulators, a different fluid, etc may help...
I have lowered the pedal (a lot) to avoid unintended brake drag. Have changed the brake fluid (just replaced with the standard dot 5) , and have even ground two quarter inch vertical grooves in my pads to aid cooling and lower friction a bit..all to no avail
has anyone had this problem? any tips? I am wondering if lower friction pads, extra insulators, a different fluid, etc may help...
The Shop
Like someone else mentioned…hope you didn't put DOT 5 in there
...that's pretty bad
Whats wrong with dot 5? What the difference?
Also, look into Galfer Semi-Metallic or their Sintered Ceramic. Their quality control is way better than EBC and they're about the same price.
I'd also check to make sure your rear rotor isn't bent or warped.
DOT 5 i believe is silicone based, so doesnt work on our bikes.
http://motocrossactionmag.com/home-page/homepage-new-products/mxa-team-…
Pit Row
to answer another question or two, my rear rotor is not in bad shape, its pretty well used but has not been run metal on metal nor is it warped/bent.
I will have to say, these sintered EBC pads may be the bulk of the issue. I bought them because stock pads were something stupid ..maybe $65 or so.
I am going to change pads and research some better fluid an d see how it goes. possibly even the magnum pads with the little radiator built on. has anyone tried them?
DOT 5 can be used in our bikes but you have to completely disassemble the brake system and clean all of the DOT 3 / DOT 4 fluid out of it before using DOT 5. That would be a serious undertaking. You would pretty much have to rebuild the entire M/C and Caliper. Cleaning out and drying the brake line would be a real pain.
The only real bummer about DOT3 / DOT4 / DOT5.1 fluid is the fact that it is hygroscopic. That means it readily attracts and absorbs atmospheric moisture. So you have to change out the fluid from time to time.
Before posting I figured I would check my "facts"... This came up in a search from Summit Racing:
DOT 3, DOT 4, and DOT 5.1 brake fluids are glycol-based compounds that are compatible with one another. On the other hand, DOT 5 brake fluid is silicone-based and should never be mixed with any other type of brake fluid. DOT 3, DOT 4, and DOT 5.1 brake fluids will damage painted surfaces. DOT 3 and DOT 4 fluids have lower boiling temperatures than DOT 5 and DOT 5.1. Furthermore, DOT 3, DOT 4, and DOT 5.1 fluids are hygroscopic--they absorb moisture from the air. This causes the fluid to turn dark, indicating that it is time for the brake fluid to be replaced. DOT 5 fluid will not damage paint, has a boiling temperature in excess of 500 degrees F, and is not hygroscopic
Shane
One more idea that I dont think has been suggested: Adjust your lever down a little.. Maybe 1/8"..
I know control setup is one of the most personal things about your bike, but I have read that its usually best to have your brake level with your peg.
Post a reply to: KX450F rear brake overheats badly...what to change...