Thread: Vibration/Shemmy Problem *solved

EDIT: wheel bearing theory back into play...

My managers seem to think it's a bent rim and they want me to go to a shop. SO to avoid this cost intially, I decided to get under and look for myself. The rims look fine to me.

Shortly after checking a few things, I ran across 2 things that raised an eyebrow.

1). I spun the tires, without ever applying the brake at this point, and ALL of the tires you can see the surface jump up and down ever so slightly. Does this pose a problem or is this normal? The tires are a year old give or take some months.

Here is a vid (apologies for the iPhone camera, but you can clearly see the surface of the tire as it moves up and down while its spinning): 2003 Blue GTP :: IMG_0545.mp4 video by BrandonL2000 - Photobucket

2). I applied the emergency brake, not part of my test. But to my surprise I spun the back wheels yet again after releasing the brake, and heard this noise coming from the brakes. My theory is warped rear rotors. You can hear the surface of the pads coming in contact with the rotor at a certain point in the rotation, suggesting to me that it's warped. The front wheels make a smooth sound (unlike the rear) as the pads make slight contact with the whole rotor as it spins in rotation. Could this be warped rear rotors?

So here is a vid of the sound of the pads touching the rotor, theory: warped rears: 2003 Blue GTP :: IMG_0546.mp4 video by BrandonL2000 - Photobucket


Given all this, I'm thinking either tire issue (unlikely given new-ish tires AND the fact that ALL tires do this same thing)

OR I'm thinking it's just the rear rotors warped, since I do not feel much of anything when braking at high speed, and rear brakes don't do much anyway...

OR I'm thinking a bent rim given the movement in the tires But what's the chances ALL the tires or ALL the rims have a problem?

But even if you don't know, maybe you could share if your tires do this same up and down motion ever so slightly while spinning. If it's normal I can throw out that idea.

1 st vid the tire does seem to have wobble to it,

2 nd vid, that sounds like the e brake shoes not backed off all the way, inside the disk is a set of brake shoes, and the inside of the disk has a drum built into it. that how the e brake works.

Originally Posted by scottydoggs

1 st vid the tire does seem to have wobble to it,

2 nd vid, that sounds like the e brake shoes not backed off all the way, inside the disk is a set of brake shoes, and the inside of the disk has a drum built into it. that how the e brake works.

so what are you suggesting lol..

all the tires have that same wobble which confuses me.

Originally Posted by brandonl2000

so what are you suggesting lol..

all the tires have that same wobble which confuses me.

well being that you had the ebrake on then it makes this noise tells me maybe it always hangs up after you use it, and you never knew it, then it free's its self up down the road, so you could remove the rotor and clean and inspect the ebrake parts and re adjust the shoes too. if you ever did rear drum brakes its the same thing really, just a lot smaller set up.