are warped discs dangerous - Honda Motorcycles - FireBlades.org
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post #1 of 19 Old 02-10-2012, 12:56 PM Thread Starter
 
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are warped discs dangerous

hi lads, the front discs are either warped or bent as i can feel a bit of a judder when im braking, is it dangerous to ride the bike this way or is it just annoying, when not under breaking the bike is level and true. thanks
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post #2 of 19 Old 02-10-2012, 2:05 PM
 
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Re: are warped discs dangerous

Yes.
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post #3 of 19 Old 02-10-2012, 2:11 PM
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Re: are warped discs dangerous

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Originally Posted by hwap View Post
hi lads, the front discs are either warped or bent as i can feel a bit of a judder when im braking, is it dangerous to ride the bike this way or is it just annoying, when not under breaking the bike is level and true. thanks

Judder could be due to other things though. Have you actually checked if the discs are straight?
Not really dangerous. The main problem is that the discs will knock the pads back into the calipers so it's possible you might have to pump the lever a couple of times if you haven't used the brakes for a while. My 929 has badly warped discs but I race it just fine. On the road it does get annoying though.
Full floating discs for racing have the same problem, they float so much they knock the pads back which reduces brake drag but can give you a fright when you grab them, especially if the bars have been flapping out of the previous corner :-)

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post #4 of 19 Old 02-10-2012, 4:03 PM
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Re: are warped discs dangerous

Check your front wheel bearings
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post #5 of 19 Old 02-10-2012, 4:43 PM
 
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Re: are warped discs dangerous

I have a similar issue. My whole front end shakes when I apply th brakes going over 65mph. I can actually c th whole wheel shaking. Would improper installation of th wheel cause this? Or other thoughts? Don't mean to jack th thread.
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post #6 of 19 Old 02-10-2012, 5:28 PM
 
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Re: are warped discs dangerous

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Originally Posted by crazie929 View Post
I have a similar issue. My whole front end shakes when I apply th brakes going over 65mph. I can actually c th whole wheel shaking. Would improper installation of th wheel cause this? Or other thoughts? Don't mean to jack th thread.
My 954 had this problem (heavy breaking from high speeds) and it was the discs. I doubt that you have installed the wheel incorrectly.


Simon
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post #7 of 19 Old 02-10-2012, 5:38 PM
 
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Re: are warped discs dangerous

Thanx r15suk u pretty much confirmed what I was thinking. I'll jus get replacements as I need to replace th rear rotor anyway.
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post #8 of 19 Old 02-11-2012, 2:21 AM
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Re: are warped discs dangerous

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Originally Posted by crazie929 View Post
I have a similar issue. My whole front end shakes when I apply th brakes going over 65mph. I can actually c th whole wheel shaking. Would improper installation of th wheel cause this? Or other thoughts? Don't mean to jack th thread.

Did anything happen to the bike shortly before you noticed this?
Is the wheel in the right way around?

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #9 of 19 Old 02-11-2012, 2:51 AM
 
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Re: are warped discs dangerous

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Originally Posted by bladeracer View Post
Did anything happen to the bike shortly before you noticed this?
Is the wheel in the right way around?
I bought th bike not running. It had been parked for a year. I had to bring it up to riding conditions so th shaking came from th get go. I replaced th pads and th wheel is spinning in th right direction. I have no issues while riding. I've gone up to 150mph and th ride is so smooth. It only happens when I apply th brakes at high speeds. One thing I remember now is when my dad n I were installing th tire onto th rim, he used a pry bar and I noticed he was using th rotor as leverage and I saw th rotor give way. That's prob what caused th disks to b warped...more like bent. It jus hadn't clicked till now. Could that b it?
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post #10 of 19 Old 02-11-2012, 3:04 AM
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Re: are warped discs dangerous

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Originally Posted by crazie929 View Post
I bought th bike not running. It had been parked for a year. I had to bring it up to riding conditions so th shaking came from th get go. I replaced th pads and th wheel is spinning in th right direction. I have no issues while riding. I've gone up to 150mph and th ride is so smooth. It only happens when I apply th brakes at high speeds. One thing I remember now is when my dad n I were installing th tire onto th rim, he used a pry bar and I noticed he was using th rotor as leverage and I saw th rotor give way. That's prob what caused th disks to b warped...more like bent. It jus hadn't clicked till now. Could that b it?

Warped is from heat and is virtually unstraightenable.
Bent is bent from external force and is usually fixable.
However, using them for leverage when removing the tyre would be a lot of force indeed.
Spin the wheel and see if it's dragging against the pads.

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post #11 of 19 Old 02-11-2012, 3:06 AM
 
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Re: are warped discs dangerous

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Originally Posted by bladeracer View Post
Warped is from heat and is virtually unstraightenable.
Bent is bent from external force and is usually fixable.
However, using them for leverage when removing the tyre would be a lot of force indeed.
Spin the wheel and see if it's dragging against the pads.
I'll give it a check this weekend and post what I find.
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post #12 of 19 Old 02-11-2012, 5:49 PM Thread Starter
 
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Re: are warped discs dangerous

easiest thing to do. is undo the calipers from their mounts, spin the wheel and look at the discs, you will see if they are straight or bent/warped
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post #13 of 19 Old 02-12-2012, 3:00 AM
 
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Re: are warped discs dangerous

I went to a local bike tire shop to get a quote for some new rotors. Th mechanic takes a look, adjusts th brake lever. I go for a spin an th vibration is virtually gone. What he told me was that I was "over pressurizing" th system and also having floating brakes will cause some vibration. He said my rotors were fine. Man I felt like an idiot. Live n learn huh.
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post #14 of 19 Old 02-12-2012, 3:55 AM
 
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Re: are warped discs dangerous

thanks for the update on what it ended up being the prob.

At least it's fixed now
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post #15 of 19 Old 02-12-2012, 2:15 PM
 
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Re: are warped discs dangerous

Quote:
Originally Posted by crazie929 View Post
I went to a local bike tire shop to get a quote for some new rotors. Th mechanic takes a look, adjusts th brake lever. I go for a spin an th vibration is virtually gone. What he told me was that I was "over pressurizing" th system and also having floating brakes will cause some vibration. He said my rotors were fine. Man I felt like an idiot. Live n learn huh.
How did he adjust the brake lever? Do you mean the span adjusters (the dial on the lever).

Cheers
Simon
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