Help, what the heck have I done?
- Thread starter skydivr
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Jza
Registered
On the second pic, the top piston hasnt depressed at all.. so it looks like thats the culprit (not sure which side that equates to) and is why the discs warped - the other side is pushing in fine so its putting stress on the disc from one side more than the other.. when the disc gets hot its warped badly..
J
J
UPDATE: The drama continues:
I received Charlie's old rotors Friday (THANK YOU CHARLIE) but did not get to mess with them until last night). I put the first rotor on, snugged up the bolts and put on the rim. When I spun it, it cavitated as much as the old one or even more. I even took a video:
[video=youtube_share;JTSKDNR0zjc]http://youtu.be/JTSKDNR0zjc[/video]
I received Charlie's old rotors Friday (THANK YOU CHARLIE) but did not get to mess with them until last night). I put the first rotor on, snugged up the bolts and put on the rim. When I spun it, it cavitated as much as the old one or even more. I even took a video:
[video=youtube_share;JTSKDNR0zjc]http://youtu.be/JTSKDNR0zjc[/video]
So then, I took it off and put the OTHER one he sent me on:
[video=youtube_share;PpLiVFrWbe8]http://youtu.be/PpLiVFrWbe8[/video]
I am totally confounded. You can see the right rotor seems to spin fine as comparison. So, what's up here? Are the rotors bad? Is my wheel bad?
[video=youtube_share;PpLiVFrWbe8]http://youtu.be/PpLiVFrWbe8[/video]
I am totally confounded. You can see the right rotor seems to spin fine as comparison. So, what's up here? Are the rotors bad? Is my wheel bad?
I feel your pain on this one. I'm still fighting the shudder I get when braking. I'm homing someone at the Bash will have a suggestion on mine. As far as yours....we need to get yours sorted out so you are not "stuck" riding your mini Busa.
After watching your video it appears your left rotor has a bit of wobble. This may or may not be due to the rotor being bent. Your rotor floats on those little buttons between the outer ring and the center piece. It actually moves a little horizontally from side to side.
When you install the caliper and apply the brakes the rotation of the disk should self align if the rotor is not bent.
If the rotor is bent, as soon as you release the lever the wobble of the disk will instantly push the pads away from the rotor to the extent of the wobble. When you reapply the brake you'll find excessive travel in the lever before the pads squeeze the disk.
I have actually seen bent rotors that would require two or three pumps of the lever to engage the brake.
Put the rotors back on Keith, then take that beast for a ride and you'll get it figured out fairly quickly.
SteveO
When you install the caliper and apply the brakes the rotation of the disk should self align if the rotor is not bent.
If the rotor is bent, as soon as you release the lever the wobble of the disk will instantly push the pads away from the rotor to the extent of the wobble. When you reapply the brake you'll find excessive travel in the lever before the pads squeeze the disk.
I have actually seen bent rotors that would require two or three pumps of the lever to engage the brake.
Put the rotors back on Keith, then take that beast for a ride and you'll get it figured out fairly quickly.
SteveO
This video is showing up as private. Can't play it.
Jza
Registered
Just to say that whilst putting a new disc on will sort it out short term... you'll just warp then new one - you need to get the brake caliper serviced theres something really wrong there... somethings sticking.
PS despite the advice of "giving it a test ride".. please dont ride the bike until its fixed.. would hate to hear you crashed with no brakes!! Dead aint worth the $$$$ you'd save trying to figure it out?????
PS despite the advice of "giving it a test ride".. please dont ride the bike until its fixed.. would hate to hear you crashed with no brakes!! Dead aint worth the $$$$ you'd save trying to figure it out?????
EarlyBird
Donating Member
Shudder on your busa with new rotors? Or are they used? What pads and rotors are you using? How many miles on them?
I know am working on it similar to second one; for some reason youtube isn't letting me change the settings right now
I am hoping that I have sorted out/rectified the caliper problem as it pumped out when I tied the others off. And when I say "test ride", I mean up and down the block, as I still have a rear and had good braking even with it messed up. But yes thanks for the concern and reminder. If I'm not satisfiied, I'll be bringing my 1K to the bash instead...
Another little sleeper I'll share with you fellers:
If you are getting that shutter from the front when you are hard on the brakes it's usually due to a rotor problem. However, I have experienced the same shutter that felt like a disk issue but wasn't. After spending a considerable amount of time trying to sort out the problem an old gray haired racer says, are you bottoming your forks out on braking? After sorting it out, I found I WAS bottoming out the forks on hard braking at times. Not a consistent problem.
It felt exactly like a bent rotor but what it was doing once the forks bottomed out the flex in the tire became the only suspension remaining. This caused the tire to loose traction and skip resulting in the same type of shutter a bent rotor would create.
Something to put in the back of your memory bank for future reference!
If you are getting that shutter from the front when you are hard on the brakes it's usually due to a rotor problem. However, I have experienced the same shutter that felt like a disk issue but wasn't. After spending a considerable amount of time trying to sort out the problem an old gray haired racer says, are you bottoming your forks out on braking? After sorting it out, I found I WAS bottoming out the forks on hard braking at times. Not a consistent problem.
It felt exactly like a bent rotor but what it was doing once the forks bottomed out the flex in the tire became the only suspension remaining. This caused the tire to loose traction and skip resulting in the same type of shutter a bent rotor would create.
Something to put in the back of your memory bank for future reference!
KvHotDog4
Registered
Keith I know you have already said no air is in the line, but in my opinion I would try to bleed them again. I am not 100% on the gen 2 calipers but if they are like the gen 1 you can have one side bled and the other still have air pockets in them. This would also explain why the pistons came out when holding back working pistons.
As far as the little movement that is in the rotor, as with anything, it has a tolerance and will not be perfect thats why the disk is on floater buttons it aligns when being pressed by the caliper. (My work computer doesn't play videos well and it may be moving more than my computer is showing.)
If you don't have it fixed by this weekend you can bring it to my house and I will take a look at it, but I am still going to say is air trapped in the caliper. If it was stuck I don't see both pistons getting stuck at the same time.
As far as the little movement that is in the rotor, as with anything, it has a tolerance and will not be perfect thats why the disk is on floater buttons it aligns when being pressed by the caliper. (My work computer doesn't play videos well and it may be moving more than my computer is showing.)
If you don't have it fixed by this weekend you can bring it to my house and I will take a look at it, but I am still going to say is air trapped in the caliper. If it was stuck I don't see both pistons getting stuck at the same time.
KvHotDog4
Registered
Another thing you could do to check if it is/was stuck. Push the pistons back, it should feel stiff but have a smooth motion. If it feels choppy when it is pressed back you have debris in your caliper around the piston (rebuildable) or the sidewalls of your piston chamber is scuffed up (new caliper)
Update: Ok, Charlie's rotors are REALLY out of round, so now I know the difference in that.
Heeding Tuf's advice, I put my old roter back on, backed off all the pads, and turned the wheel around backwards, put the calipers on. Problem reversed itself. That means the one roter is bad. Justin, in the morning I'l be calling you for a rotor order in the hope you can get to me by Friday along with a new set of pads....
Heeding Tuf's advice, I put my old roter back on, backed off all the pads, and turned the wheel around backwards, put the calipers on. Problem reversed itself. That means the one roter is bad. Justin, in the morning I'l be calling you for a rotor order in the hope you can get to me by Friday along with a new set of pads....
I hope Justin can take care of you and that's all there is to it. At least that's the kind of work that can be done at the Phillips if need be. Heck, I think past Bashes have proven that pretty much any kind of work can be done there!
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