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Old 07-12-2008, 07:58 PM   #21
bumblebee
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Quote:
Originally Posted by SBK Pilot View Post
+1

make sure you are using high temp brake fluid if you're doing more and more track days...
I will. I have the hi zoot racing already I just gotta put it in.



On of my riding buddies suggested i rebuild the calipers. He said that dust build up under the dust seal might interfere with the brakes operation.
I think it is a good idea to rebuild them but I'm not so sure it would cure THIS problem.
Whaddaya think?
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Old 07-12-2008, 09:16 PM   #22
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i think the fluid is to blame.
i once owned a ZX12 that had fluid that would cause the rear tire to lock up if you so much as trail bkaked once too often.just a dirty system
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Old 07-12-2008, 09:16 PM   #23
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Quote:
Originally Posted by bumblebee View Post
I will. I have the hi zoot racing already I just gotta put it in.



On of my riding buddies suggested i rebuild the calipers. He said that dust build up under the dust seal might interfere with the brakes operation.
I think it is a good idea to rebuild them but I'm not so sure it would cure THIS problem.
Whaddaya think?
Could be, but stick with doing the easy stuff first.

Like I said, I hope Doug is right because it's easy and doesn't cost anything.

You're right about the warped rotors, but with floating rotors or semi floating rotors, it's not always the case that you'll feel them progressively- floating radial calipers (like I think your bike should have) will quell this "feeling" as well. That's it's job.

It may not be warped enough to feel until you get a good squeeze on them. I've had this happen before, that's the only reason I mention it.

Getting all of the pad material out of the rotors and "clean" pads also help.

You're a reasonable guy with apparently some mechanical skills, I'm sure you'll figure it out based on suggestions.
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Old 07-12-2008, 10:59 PM   #24
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If you ask my wife or daughter they might disagree about me being reasonable.
I will keep on it until I get it figured out or my pants whichever comes first.

Thanks again for all the suggestions.
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Old 07-12-2008, 11:03 PM   #25
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Maybe you're braking too hard while going over potholes...
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Old 07-13-2008, 12:19 AM   #26
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Maybe you're braking too hard while going over potholes...
It aint like that. It's a hard shudder, that lasts until I release the brakes.
This can be scary at a buck fifty with a turn coming up.
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Old 07-13-2008, 05:00 AM   #27
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Can you feel the shutter through the break leaver? If you can I would say it is a rotor. If you can't, It could still be hydraulic locking. Forks don't have to bottom for this to happen. Old fluid or incorrect fluid weight could cause the problem or rebound or compression set to high or even a bad shim stack. You should also have your suspension freshened at least once a year BTW.
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Old 07-13-2008, 08:06 AM   #28
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Quote:
Originally Posted by Mongrel View Post
Can you feel the shutter through the break leaver? If you can I would say it is a rotor. If you can't, It could still be hydraulic locking. Forks don't have to bottom for this to happen. Old fluid or incorrect fluid weight could cause the problem or rebound or compression set to high or even a bad shim stack. You should also have your suspension freshened at least once a year BTW.
Nothing thru the lever.
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Old 07-13-2008, 09:05 AM   #29
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Quote:
Originally Posted by Mongrel View Post
Can you feel the shutter through the break leaver? If you can I would say it is a rotor. If you can't, It could still be hydraulic locking. Forks don't have to bottom for this to happen. Old fluid or incorrect fluid weight could cause the problem or rebound or compression set to high or even a bad shim stack. You should also have your suspension freshened at least once a year BTW.
That's not necessarily true, with floating rotors and pads you won't necessarily feel it through the lever pull.

"Hydraulic locking" is kindof rare these days with modern fluids anyway.

I think you'll be fine "BB" if you try Doug's suggestion and some of the easy maintenance items that were suggested. None of that stuff is going to hurt anything anyway and is part of a good routine maintenance program. If it is something like "Mongrel" is suggesting, a good bleed with fresh racing quality fluid should knock that out too.

Good luck!
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Old 07-13-2008, 11:14 AM   #30
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Quote:
Originally Posted by bumblebee View Post
It aint like that. It's a hard shudder, that lasts until I release the brakes.
This can be scary at a buck fifty with a turn coming up.
Sorry, that was meant to be sarcastic... I hit the wrong emoticon.
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Old 07-13-2008, 09:54 PM   #31
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Quote:
Originally Posted by bumblebee View Post
I have an '04 GSXR750 trackbike all set up with the good stuff. (Fork internals, penske etc.)
Lately (last couple of trackdays) when I get a lot of speed on a straight and then get on the brakes HARD for the next turn the front shudders hard.
Not like headshake, not like a warped rotor just a hard shudder until I let off and then reapply. That usually will make it stop but by then I'm having a conversation with the Lord about making the turn.
I have checked the steering head bearings, rotors, calipers, etc. everything is tight.
I have cleaned the rotors with scotchbrite, that seemed to help but not a complete remedy.
I changed brake pads and thought that was the cure but last weekend at Eagles Canyon it happened again. A couple of times.
If I don't get a really good drive and some serious speed or if I'm easy on the brakes it seems to be OK but if I need to do some hard braking, sheesh I'm gonna have to start wearing diapers.


Any thoughts?

Charlie,
Sounds like you may be bottoming the front end, hence the chatter.
Increase your compression damping a tad and maybe dial in some preload.
What's your sag set at right now?

Give me a call Tuesday and we can discuss it further.
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