vibration at slow speed braking - Page 2 - KawiForums - Kawasaki Motorcycle Forums
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post #11 of 14 (permalink) Old 11-06-2012, 01:51 AM
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I have EBC on the front of my bike because I thought the stockers where warped, turns out they are not, that was an expensive attempted fix. at 90+mph I get the same shutter with no breaking. The steering is tight but I sounds like I have beads in my tire or something but coming from the axle. About the only thing it can be is the wheel bearings so they will be getting replaced with a new front tire come spring. It feels just like a warped rotor when I hit the breaks though.

PRS is right, if its a warped rotor then you should feel it no matter how fast you are going when you hit the breaks, it should just pulsate faster. It should actually feel worse breaking hard at higher speeds. That is unless they are barely warped and you are not feeling it at higher speeds because you have lower end pads and the heat compensates or something.

Ide replace the bearing first just to make sure since they are really cheap before spending a crap load on new rotors.

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post #12 of 14 (permalink) Old 11-06-2012, 12:35 PM Thread Starter
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Quote:
Originally Posted by prs View Post
Since he said his braking is fine at high speeds, wouldn’t a warped rotor be noticeable at higher speeds and not so noticeable at slow speeds of 10-20 kph as the OP posted? That’s always been my experience and I’m riding a bike now that has a slightly warped rotor.


And to the OP, when you brake “hard” at 10 or 20 kph you tend to stop on a dime so I don’t think you’d notice a warped rotor braking “hard” at such slow speeds. Just my $.02. What am I missing?
when i said i brake hard at 20kmph, i meant maybe around 60-70% braking force, hard enough to stop quick but not like a panic stop. and that's when it gives me that vibration, and the vibration feels like someone just attached a spinning motor onto my bar, it vibrates at a quite high frequency.

maybe its brakepads?
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post #13 of 14 (permalink) Old 11-06-2012, 12:45 PM
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Quote:
Originally Posted by jy7347 View Post
when i said i brake hard at 20kmph, i meant maybe around 60-70% braking force, hard enough to stop quick but not like a panic stop. and that's when it gives me that vibration, and the vibration feels like someone just attached a spinning motor onto my bar, it vibrates at a quite high frequency.

maybe its brakepads?


Okay, but even at 60-70% you stop pretty quickly at 15 kph, correct? A warped rotor gives that pulse feeling in the bars as the rotor rotates and the pads lose/regain contact where the rotor is bent. The faster you are going, the faster, more noticeable the pulse is. You are stopping relatively quick so there’s no time for the rotor to keep rotating with the pads losing this contact and feeling the pulse in the bars.

I don’t know what it is but it still doesn’t sound like a warped rotor to me. That being said, I know a couple who posted in this thread (Sev & GTScotand) are way more mechanical/knowledgeable than I so take what I say with a grain of salt. Having admitted this, I still don’t think it’s a warped rotor. Good luck and let us know when you find out for sure.

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Last edited by prs; 11-06-2012 at 01:07 PM.
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post #14 of 14 (permalink) Old 11-06-2012, 02:12 PM Thread Starter
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Originally Posted by prs View Post
Okay, but even at 60-70% you stop pretty quickly at 15 kph, correct? A warped rotor gives that pulse feeling in the bars as the rotor rotates and the pads lose/regain contact where the rotor is bent. The faster you are going, the faster, more noticeable the pulse is. You are stopping relatively quick so there’s no time for the rotor to keep rotating with the pads losing this contact and feeling the pulse in the bars.

I don’t know what it is but it still doesn’t sound like a warped rotor to me. That being said, I know a couple who posted in this thread (Sev & GTScotand) are way more mechanical/knowledgeable than I so take what I say with a grain of salt. Having admitted this, I still don’t think it’s a warped rotor. Good luck and let us know when you find out for sure.
thanks! well im quite a noob so i wouldnt really know either, when others said its because of a warped rotor, i thought a warped rotor would give the kind of vibration i am getting now, anyways... i guess i will take it to the shop, maybe try new brakepads first since thats a cheap fix
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