vibration, plz help.. - Honda Motorcycles - FireBlades.org
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post #1 of 38 Old 05-05-2008, 1:33 PM Thread Starter
 
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vibration, plz help..

hellow, got a 1999 mod cbr900rr with only 24.000km on the clock
but i got vibration in the front brakes, the wheel is ok and i just exchange the front brakedisks
but still vibrate when breaking, first owner did forget a lock on the breake disk when trying to drive off, can that have hurt the breake calipper/shock-absorber ?

eny ideas what to do ?
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post #2 of 38 Old 05-06-2008, 5:57 AM
 
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Re: vibration, plz help..

the rotors are probly warped, but also check to see if you have any play in the wheel bearings and also check that everything is tight, then get new rotors.

when you are on a honda you are on the best
2002 CBR954RR
scott
www.itriderz.com
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post #3 of 38 Old 05-06-2008, 8:33 AM
 
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Re: vibration, plz help..

i would change the wheel bearings as they are reasonably cheep to do , and also make sure the head bearing is ok and doesnt need tightening , he shouldnt have been going fast enough to cause any real damage the the caliper
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post #4 of 38 Old 05-06-2008, 8:41 AM
 
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Re: vibration, plz help..

I had a vibration when applying the front brake on my RRW, but it didn't seem too bad so i just ignored it. I didn't ignore the looseness in the front end, though, and the shop I brought it to confirmed my fork bushes and seals were shot and steering head bearing should be changed.

I'm waiting for the ... darn... parts to be delivered (they tell me it will take 3 weeks!!) but I'm thinking I will lose the vibration when the front end is rebuilt. I'll let you know if it proves successful.
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post #5 of 38 Old 05-06-2008, 12:27 PM Thread Starter
 
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Re: vibration, plz help..

the old disks was warped for some time
bought new breakedisks "used ones", but did buy them from a mc dealer, he told me they was NOT warped, no did not buy new pads as they are almost new
wont the pads "asjust" them selvs to a new set of disks ?

if not can i sand them down my selv so they become even ?
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post #6 of 38 Old 05-06-2008, 1:59 PM
 
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Re: vibration, plz help..

Easy way to check if the discs are warped is to get a piece of card, tape it to the fork leg so that it just clears the disc, get the front wheel off the ground & spin it slowly, if the disc is warped you should see the gap changing as you spin the wheel.

If the gap changes either the disc is warped or it is not fitted correctly.
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post #7 of 38 Old 05-06-2008, 3:06 PM
 
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Re: vibration, plz help..

What vibrates when you are braking? Is it the brake lever, the bars, the front wheel?

Does it only happen for a second or two or does it continue all the way to a stop?

Here are some candidates for your issue:
Wheel out of balance
Wheel bearings worn
Head bearings loose or worn
Rotors warped
Caliper or mounting bent

Answering the above questions will help us target the offending parts.
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post #8 of 38 Old 05-06-2008, 3:18 PM Thread Starter
 
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Re: vibration, plz help..

the brake lever is pulsing a bit but it feels that it is the caliper or the brake disk that makes the vibrate
it goes from all the way to full stopp

what makes a rotor get warped and can it get fixed ?
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post #9 of 38 Old 05-06-2008, 7:21 PM
 
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Re: vibration, plz help..

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Originally Posted by CBR900RRR View Post
the brake lever is pulsing a bit but it feels that it is the caliper or the brake disk that makes the vibrate
it goes from all the way to full stopp

what makes a rotor get warped and can it get fixed ?
That sounds like a warped or bent rotor. Is the vibration the same as with the old rotors? If so then its probably not the rotors because it would be near impossible for different rotors to be warped the same.

To eliminate the rotors for sure you need to measure the run out.

Mount a pencil on the fork leg so the point touches the disk. spin the wheel and make sure the pencil touches all the way around. then do the same on the other rotor.

If the pencil does not stay in contact with the rotor then the rotor is warped or bent. If it does stay in contact then something else is wrong.

Have you looked at your caliber mounting bolts to ensure they are not bent?

It is critical that all braking components are straight, I am concerned about the disk lock hitting the caliper.

The idea here is to eliminate what is good so we can isolate what is bad.
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post #10 of 38 Old 05-07-2008, 4:22 PM Thread Starter
 
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Re: vibration, plz help..

what is the reasen for a rotor to get warped if you drive "normal" ?
the vibration is smaler with new (used) rotors, but same type of vibration

did the pencil trix today, as far as i can see it touches all the way around
did take out the brake pads and all 4 looks the same

by "caliber mounting bolts" do you meen the bolt that fasten the caliber to the shock ?

i cant see enything wrong with : wheel,caliber,shock,pads,rotor

eny idea's ??
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post #11 of 38 Old 05-07-2008, 4:45 PM
 
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Re: vibration, plz help..

When you have the front wheel off the ground, spin the wheel & gradually apply the front brake, does the brake bite & release, bite & release, if it does you may have a high spot on one of the discs.

I had this problem 3 years ago on my 929. To cure the problem I used a small very fine abrasive stone to rub the high spot down.
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post #12 of 38 Old 05-13-2008, 7:39 AM Thread Starter
 
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Re: vibration, plz help..

i have taken all apart and change the front damper oil becouse of a bad oil-ring
front wheel bearing,stearing bearing,caliber,damper looks fine
pads looks almost alike, but not 100% even
with the front brake half inn at slow speed i can feel : brake-relese-brake-relese
feels like when the wheel har gone one time around the brake "takes" harder at "one" point

is this still typical for a bad brake disk ?
talked to the mc-shop again and he said he did measure brake disk's before sending and they was 100% ok

plz help me, going to tae track soon and got to get this sorted!!
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post #13 of 38 Old 05-13-2008, 7:49 AM
 
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Re: vibration, plz help..

daft question but has it got to much brake fluid in the reservoir . as i know someone on another forum that had a similar problem and took out some brake fluid cos it was over full and problem went away
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post #14 of 38 Old 05-13-2008, 2:17 PM Thread Starter
 
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Re: vibration, plz help..

Quote:
Originally Posted by hioctaine View Post
daft question but has it got to much brake fluid in the reservoir . as i know someone on another forum that had a similar problem and took out some brake fluid cos it was over full and problem went away

why cud a over full resevoir make a problem like mine ?

you think a forgotten disk lock when taking off on the bike cud bend the front axle ?
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post #15 of 38 Old 05-13-2008, 2:37 PM
 
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Re: vibration, plz help..

Quote:
Originally Posted by hioctaine View Post
i would change the wheel bearings as they are reasonably cheep to do , and also make sure the head bearing is ok and doesnt need tightening , he shouldnt have been going fast enough to cause any real damage the the caliper
I agree - I had head shake on mine at about 25000kms and it felt like vibration from the breaks.
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