I do a lot of range riding on my Hayabusa and I'm having trouble with my rear brake, it seems that the more I use the rear brake the freeplay in the pedal gets more and more until there is no brakes at all, but it does come back to normal. It's like it sucks in air from somewhere, I have put a new seal kit in the master cylinder, but problem is still there.
I have bled the brakes several times, but still same.
Highway riding is fine, it seems to only happen on the range when you use it more.
Has anybody else experienced this problem, any idea's would be appreciated.
You sure it's an "air leak" and it not actualy cooking itself? Shane
Jimboomba QLD
No, I don't think so, because pedal definately falls away otherwise it should stay stiff. There is no fluid leak either.
Not a warped disk?????? Had one go on my bus at about 15k, replaced under warranty. Service limit is .02mm from memory. mine was over .6mm out. felt lousy at speed and pulled up with a chugging sort of a motion
Tom "No Fear" Just means you aint goin quick enough yet !!!!!
Have you bled the brakes enough to flush all the old fluid out?? Sounds like your boiling the fluid.
Check for free piston movement in the caliper too , if one is dragging it may contribute to the problem.
For what it's worth: there are two (2) bleed points on the rear caliper, inner & outer, bleed both.
Thanks guys, I'll try these things and let you know how I go.
yep them two points caught me the first time around when i changed brake lines.
Tom "No Fear" Just means you aint goin quick enough yet !!!!!
Maybe you're riding the rear brakes so much they are just fading????
From suggestions made it is possible that the brake fluid may be boiling, I have never come across this on any of my other bikes while riding the range.
Like I said, I changed the seal, bled the brakes again & again (both points).
I'm thinking maybe of changing the pads or looking to another type of brake fluid to try and stop any further heat transfer???
Any other suggestions would be helpful.
Your disc will be blue if your overheating the fluid,pads will wear fast too or have cracks in the friction material.
One guy i know was riding with us in Tassy, new rear pads before he left home, metal on metal on the 4th day.
Motocrosser ! used the rear brake mid corner under power to help control the bike, bugger to catch too
Thanks for that guys, I think it is boiling the fluid.
I might do some research into what type of brake fluid can withstand heat the best.
And I may have to slow down a bit so I don't have to use them so much.
Probably good idea to o/haul the caliper also, as it is probably more prone to fail and draw air than the master as the caliper lives in a hot and dirty environment that the master never has to endure ...... after all it is the slave
Dot 4 upward fluid should give no problem, if there is no other problem evident Providing you are using "FRESH" fluid the fluid will not be the cause of your problem.
As for slowing down ................that me be the problem You may be slowing down to much
FF1 Edited by: fasterfaster1 at: 14/10/05 5:08 am
Is it possible that you're riding with just enough pressure on the brake pedal to have the brake rubbing full time?
That would heat the oil up and then when you brake you don't have to go far before it's boiling. Once it vapourises too, it will tend to stay rubbing unless you let it cool down. Sort of fits your symptoms.
Solution? Adjust the pedal position and use the back brake less anyway.
cheers
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