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f4i has crazy shake on front braking

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Old Aug 16, 2008 | 06:24 AM
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Default f4i has crazy shake on front braking

well i finally got my bike legal and ridable and took it for its first ride and Im pretty pissed off. Applying the front brake and i get a CRAZY wheel shake from the front end....any ideas on where to begin
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Old Aug 16, 2008 | 06:41 AM
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Default Re: f4i has crazy shake on front braking (swappedcx)

Bent front rotor or something wrong with the pads and/or brake cylinder....
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Old Aug 16, 2008 | 06:55 AM
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Default Re: f4i has crazy shake on front braking (KickStart2323)

I just re bled the front brakes and no air came out at all. But if i squeeze hard they still come all the way in to the bars (i have to squeeze real hard though). And upon applying and releasing the brake lever i can hear the right caliper squeak and the left doesn't...i do not know if that means anything.

Guess its time to rip the front wheel back off and check out everything else.
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Old Aug 16, 2008 | 09:03 AM
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Default Re: f4i has crazy shake on front braking (swappedcx)

Sounds like one of your calipers might be seized.
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Old Aug 16, 2008 | 09:15 AM
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Default Re: f4i has crazy shake on front braking (iLude)

I would say a warped rotor
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Old Aug 16, 2008 | 10:31 AM
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Default Re: f4i has crazy shake on front braking (Slidin'Sidewayz)

i pulled the front wheel off again. The rotors do not look warped at all, and checking them with a straight edge was hard but even if they are warped it is VERY minor.
I assembled the front end again and it did absolutely nothing. with the wheel off i squeezed the front brake with a rotor in each caliper and they both held tight and released the rotor when let go.

Any suggestions on what or how to check anything else before I just get really pissed off and buy all new rotors/calipers/master cylinder/pads?
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Old Aug 16, 2008 | 04:05 PM
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Default Re: f4i has crazy shake on front braking (swappedcx)

Even if the rotor was warped slightly it might seem worse at speed and the faster the wheel is turning. I would try replacing the rotor first.
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Old Aug 16, 2008 | 04:32 PM
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Default Re: f4i has crazy shake on front braking (eh3 93)

I was trying to let my buddy with another f4i let me put his wheel on to see if my rotors are bent...of course he wouldnt let me. These things are expensive as all hell new!
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Old Aug 16, 2008 | 05:08 PM
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Default Re: f4i has crazy shake on front braking (swappedcx)

I'm pretty sure you can find a used one for cheap.
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Old Aug 16, 2008 | 05:26 PM
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Default Re: f4i has crazy shake on front braking (swappedcx)

how does the bike run from 0-60? Does it shake when you're cruising at all?
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Old Aug 16, 2008 | 09:29 PM
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Default Re: f4i has crazy shake on front braking (big pete)

Besides the fact that I could have swore my old gsxr would have raped this f4i, the bike runs and rides fine. Its perfectly smooth until you hit the brakes. The rotors probably are bent, this being the first time I ever rode it and I left the rotors on the rim when they changed the tire and something could have happened.

So tomorrow I finally realized I should have just slapped my dial indicator on it and checked the runout of the rotors. I will do that tomorrow and I will know exactly how far if any the rotors are bent.
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