Brake Rotor Wobble? - Sportbikes.net
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post #1 of 8 (permalink) Old 11-12-2012, 04:21 PM Thread Starter
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Brake Rotor Wobble?

Hey guys, I was cleaning my bike today and while going over it I noticed that my rotors are a bit loose. The actual disc can move backward/forward/up/down in the carrier, only about a millimeter or two. They can also move side to side a bit. This is my 5th motorcycle and I've never noticed this before.

When pushing the bike around my garage if I go backwards and then hit the brake Ill hear a small clank, and then when I go forward again and brake I'll hear the clank again. I don't feel any wobbling when I'm braking while riding though. The bike has about 8,700 miles.

I tried googling it but I found all kinds of contradictory answers so I came to the trusted SBN knowledge base. Is this normal for floating discs or do I need to pick up a new set of rotors?

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post #2 of 8 (permalink) Old 11-12-2012, 04:35 PM
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Does your bike have floating discs? Floating discs will have some play.

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post #3 of 8 (permalink) Old 11-12-2012, 04:37 PM
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yup, perfectly normal, just the floating rotor. allows for expansion and contraction as they heat and prevents warping. many bikes will have a spring washer behind the buttons to prevent obvious movement and noise, and some don't... yours apparently don't.

Last edited by boner; 11-12-2012 at 04:42 PM.
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post #4 of 8 (permalink) Old 11-12-2012, 05:18 PM
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Full floating = no washer and they rattle going down bumpy roads and if you tap them .
Semi Floating = With a spring , they dont rattle but if you grab them and push and pull em around they will move .


And the clank is probably you pushing the pads back an foth inside the caliper . The pads should also have a touch of free play .

Last edited by Sequentialshift; 11-12-2012 at 05:23 PM.
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post #5 of 8 (permalink) Old 11-12-2012, 05:36 PM
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Don't worry about it, it's ok. A lot of the Road Racers will have free floating disks because it creates less drag, which means less energy used to move the wheel. How much of a difference it makes... I don't know, but I doubt much.

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post #6 of 8 (permalink) Old 11-12-2012, 06:24 PM Thread Starter
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Thanks for the replies guys, solves that problem. I did notice when I removed the front wheel that there is a lot less drag and the wheel spins more freely than it did on my FZ1.

Now I just need to see what I can do about the "lightswitch" feel of these Brembos, my old Nissins were better after I put SS lines and sintered pads on them. I'm thinking maybe if I switch to a different kind of pad Ill get a more progressive feel instead of "oh shit I've got no brakes" to "fuck fuck lockup!"

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post #7 of 8 (permalink) Old 11-12-2012, 06:39 PM
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I'm not so sure about this. I have full floating discs, but they only have play side to side. Not for and aft.


But yeah, you should easily be able to adjust the feel of your Brembos with some more progressive pads.
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post #8 of 8 (permalink) Old 11-12-2012, 08:43 PM
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Quote:
Originally Posted by jk750 View Post
I'm not so sure about this. I have full floating discs, but they only have play side to side. Not for and aft.
I think that has to do with how BrakeTech designs their rotors.
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