Okay... so I just bought new rotors for all four corners for the suspension and brake job. I just about broke every bolt on the rear so things have been slow going. Anyways, I am on the driver's rear side and when I put the rotor on I found that it did not exactly fit just right. It is kind of hard to explain but when I push on the lower half, the top half lifts off and vice-versa.
I just thought it was me not lining things up right, but when after I torqued the two screws that hold the rotor on and spun the rotor, it wobbled like you would not believe. I tried hitting the inner part of the rotor with a hammer a couple times trying to seat it but that has not worked.
The other side went on and spins just fine with little or no wobble at all. I am not sure if this is a bad wheel bearing or what. Any help would be appreciated.

 

Swap the rear rotors and see if the problem is with the wheel or the new rotor. You should be able to narrow down the problem that way and go from there. Make sure you have the correct rotor and make sure the hub is flat/true. Look for debris/object between the rotor and the hub. If the hub wobbles with the rotor off, it may be the bearing as you suspect.

 

does the hub wobble? did it shake before you installed the new rotors?

be sure to clean the hub off very well before you bolt your rotors on.

 

when u say u put the bottom on the the top lifts off, is the whole too small? i would swap them around like they saidand diagnose it from there.

 

There was slight vibration in the car but it has always been like that. I just attributed it to an old car, failing suspension, and so forth. That is the main reason I replaced almost all the suspension and brake components. I spun the hub a couple of times and it does not appear to wobble but spinning the hub by hand is kind of inaccurate way to check seems to me.
I guess I can go pull the other side apart and swap the rotors. I hate to do that though because I got everything else set except for this one corner. Also, there is no debris or lumps or anything on the hub that would prevent it from seating.

EDIT: Yeah, when I push on the lower portion of the rotor, the top comes towards me and makes the screw hole gap => gap between rotor and hub GREATER.

 

remove the disc and check the hub flange for any type of rust or debris that may cause the rotor not to sit flush, i have never seen a hub so badly warped that it would wobble like that or the wheel would have come off the car in the impact.

find a nice flat surface also and lay the rotor on it and see if it sits flat on the suface, if not then there is something seriously wrong with the rotor and the manufacturer or shipper.

 

yeah i was gonna say that too, karack; as the rotor might also be a manufacturer flaw. take it back man you spent your hard money on that ****, this is YOUR 7 were talking about. I wouldnt leave it like that.

 

I have checked the rotor against a flat surface and with a straight edge. It does not appear to warped and it rolls along just fine normally off the hub. I cannont detect that the hub is warped by just hand turning it. If there is some other way to check, please inform me. I have not had a chance to swap rotors but I think that Karack might be on to something with something not allowing the rotor to sit level. If that is the case, I am not sure what that "something" could be though.

 

was there any screws still in the hub that may have been drilled and you didn't notice that they are not sitting flush? it is common to drill the retaining screw heads off and leave the screw threads in the hub though it will stick up beyond the hub face, remove the rotor and inspect the hub face throughly visually.

 

you could put the rim on, and tourge them nuts,then see if it still wobbles

 

or warp the rotor, do as i said before torquing the wheel on if you haven't already.

 

No, there were no screws still in the hub. I removed the screws when I pulled off the rotor. From the deterioration of the rotor, caliper, and so forth I do not think the rear brake system had ever been serviced. I have not put the wheel on... I am much more careful than blinding putting stuff back together. I checked the spin on all corners before I even put the calipers back on. Below are a couple of big, high-resolution pictures of something I noticed on the backside of the rotor...

http://webpages.charter.net/acidshock/P1000907.jpg
http://webpages.charter.net/acidshock/P1000908.jpg

 

looks to me like someone tried to put it on a car already incorrectly or it is the wrong application for your car, is the hub face identical to the other side's?

be sure the hub snout is not interfering with the mounting against the hub face, if the rotor was shipped like that then it may be a good idea to get a replacement as it could be causing the rotor not to center properly.

 

Hmmm to me it appears the aluminum hub has expanded abit larger than the diameter of the rotor. My opinion would be to do some minor grinding to teh rotor or hub to see if it would fit, but dont do so if you think it wont work perfectly.

 

theres nothing wrong with your rotor. and you know you're suppose to wipe down your whole rotor with alcohol before you put it on.

 

I think this damage was caused when I pounded the rotor with a hammer a couple of times. I ordered all four rotors at the same time but to me it looks like the hole is too small to fit over that "lip" that is on the hub itself. It looks just like the rotor on the other side but of course the other side seats properly.

I honestly do not care about minor surface conditions of the rotor right now. The bigger problem is that the rotor does not fit on the hub.

 

UPDATE: I was able to swap the rotor from the other side and lo, and behold it fits just fine and flush. I am in the process of trying to contact the retailer to see what can be done about this. I hope they do not pull this **** where "It has been installed so too bad." Anyways, thanks to Karack and the others that suggested to swap sides.