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Old 03-15-2010, 11:07 AM   #1
brandontx
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Brakes acting funny

My Tuono's front brake feels like it is pulsating when braking. Sort of an on/off/on/off feeling. It is more noticable at lower speeds. Any thoughts?
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Old 03-15-2010, 11:08 AM   #2
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bent rotor?
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Old 03-15-2010, 11:08 AM   #3
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Quote:
Originally Posted by brandontx View Post
My Tuono's front brake feels like it is pulsating when braking. Sort of an on/off/on/off feeling. It is more noticable at lower speeds. Any thoughts?
Tell them to straighten up and act right!

ABS?

Is it possible the rotors are warped?
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Old 03-15-2010, 11:09 AM   #4
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bent rotor?
Quote:
Originally Posted by WWFII View Post
Is it possible the rotors are warped?
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Old 03-15-2010, 11:11 AM   #5
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I only have like 6500 miles on it. Is it possible for them to warp so soon?
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Old 03-15-2010, 11:15 AM   #6
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if they get wet when they're hot maybe??
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Old 03-15-2010, 11:30 AM   #7
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I am not sure how durable a motorcycle rotor might be. They are thin comarped to car rotors. I wonder if riding a bike hard, and washing the bike promptly afterwards might cause the rotor to warp?
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Old 03-15-2010, 11:30 AM   #8
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The rotor bobbins (floating discs) don't turn very easily could this be the problem? Are they supposed to turn easily?
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Old 03-15-2010, 12:51 PM   #9
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Old 03-15-2010, 01:31 PM   #10
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1) check air pressure


2) uneven wear on tire?


3) the rotor bushings should not spin but expand when the rotors are hot.


4) warped wheels usually wont cause only low speed vibrations, front load higher speed conditions would make it vibrate too.


5) dial indicator on the rotors would answer the question.
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Old 03-15-2010, 08:04 PM   #11
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I have had this happen on many of my bikes. Usually it is an easy fix.
1)
. a) remove the caliper
. b) try cleaning any gunk off the disk (rotor) with a green pad
. c) clean the disk with NON chlorinated brake cleaner
. d) let dry for 10 mins or so then go check it out

if you have floating or semi floating disks (rotors) and it still pulsates try this:
clean the rivets between rotor hub and rotor

1) place a drop of Kroil (best) or WD40 ( wd40 takes longer and may require multiple applications) to loosen up the crud that builds up there. DO NOT let any of the solvents get on your rotor. If you do go back to step 1a.

2) flush out the rivets with NON chlorinated brake cleaner

if these steps does not fix your problem you MAY indeed have a warped rotor. I have never seen one but I guess it could happen.

YMMV

Good luck

Last edited by BPFowler; 03-15-2010 at 08:08 PM. Reason: formating and spelling (again)
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Old 03-16-2010, 07:25 AM   #12
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Quote:
Originally Posted by less_than_coop View Post
bent rotor?
when i had a bent rotor i was getting the same vibration when braking....i also had a bent front wheel. replaced both and now its fine. i would say check the rotors too.
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Old 03-16-2010, 09:38 AM   #13
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I cleaned them some last night and the pulsating has been reduced but is not completely gone (thanks for the recommendation). Gonna scrub them some more tonight I think this is what is causing this. There is no way the rotor is warped because I've only had the bike for a year and bought it new. The T has top shelf braking parts, brembos, steel lines, etc. so it just doesn't make since that they would warp.
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Old 03-16-2010, 09:48 AM   #14
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Sounds like a bent/warped rotor to me. It could be the tire/ wheel though.
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