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help rotor thudding?...

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Old 06-29-2009 | 09:01 PM
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help rotor thudding?...

i dont know what it is....heres the issue. when i am driving and go to the right it magically is not there....but when i am going straight and left wala it thudds and shakes and is just redicuolous and sounds and feels like my wheel is gunna fall off. so i took of my brakes and just had the rotor there on the hub. i spun the rotor and it looks as if it is off balance...ie it shakes side to side and looks like there is a higher spot. it is just not balanced it seems. so idk what it can be... can my hub itself be effed up? because if the rotor was not tight on the hub without the wheel then with the wheel on and the ligs tightened. it would square everything up with my hub...idk oh and for some stupid reason there is only one place outta the two places to put the screw in. the other hole is blocked by the hub.. (i didnt do this), the one that has a swrew was missing it so i replaced it thinking that was the issue....nope
Old 06-29-2009 | 09:07 PM
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I'm starting to suspect something with the brake caliper not being tightened all the way.
Old 06-29-2009 | 09:15 PM
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oh tightened it... like i said i took it off and spun the rotor and heard the noise. i also spun the wheel while it was on jacks with everything reinstalled and tight. and guess what. THE DAMN THUDDING WAS THERE. LIKE SOMETHING IS UNBALANCED. YOU CAN HEAR IT KINDA HIT THE BRAKES.. i was thinking my rotor was warped. but this is no suddle thud. and it didnt progressively get worse it just hapend outta nowhere
Old 06-29-2009 | 09:29 PM
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Take apart your entire caliper assembly and then reassemble. Maybe I can take a look at it again on Sunday.

It's also possible that your bearings are shot.
Old 06-29-2009 | 09:32 PM
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my assembly? u meen take off my rotor as well? i was planning on swapping the rotors to see if it was indeed the rotor. if it is the rotor then i should have the same issue on the right when i swap rotors and then ill need a new rotor. if it continues with the right rotor on the left hub, then i know i have a bigger issue at hand and it becomes wasps in my living room..hahaha

Last edited by blamerobb; 06-29-2009 at 10:08 PM. Reason: ha
Old 06-29-2009 | 11:40 PM
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anyone have any suggestions
Old 06-30-2009 | 12:25 AM
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if you turn left and it shake, it means the right side is having problems, if your rotor warp you will feel it under braking. if it only happen while you turn, then it will be shocks, wheel bearing, tie rods, bushings, bent rims and tires.
jack up car on all four shake your wheels top and bottom and side to side to check if wheel bearings, tie rods, and bushing. if all four wheels is tight then it will be rims and tires.
Old 06-30-2009 | 10:28 AM
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I was actually thinking it is my wheel bearing. It hapens when I am straight and banking left. When I bank right or like a right bending street nothing. And that rotor I can turn it side to side and in and out. There is give. Most definately
Old 06-30-2009 | 10:30 AM
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Also how would I check te bearings? Also the Tierods and the bushings? And what do I look for??
Old 06-30-2009 | 03:35 PM
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Pull the rotor off of the hub. You very likely have something behind the rotor that is keeping it from seating properly on the hub. I highly suspect, after reading your comments (somewhat confusing), that one of the 2 Phillips head screws that normally hold the rotor onto the hub are interfering with the seating of the rotor on the hub face. This has happened before, there was a recent thread, where a guy put the screw in the wrong hole and the wheel would not seat on the rotor hat properly. At any rate, pull out both of the screws, remove the caliper, hang the caliper on a wire, remove the rotor, and check the screw holes and the hub face and the rotor back for proper seating. Throw the screws away, they aren't necessary, they are only there for assembly line use, and reinstall the rotors and wheels and see if the problem is still there.

What I suspect is that one of the screws broke the head off and the remains of the busted screw are keeping the rotor from seating on the hub face. You'll know when you pull the rotor off. There are 2 screws, 2 tapped holes for the screws, and 2 other holes used for forcing the rusty rotor off of the hub. Make sure you, or someone else hasn't mixed up the 4 holes.

Last edited by justjim; 06-30-2009 at 04:00 PM.
Old 06-30-2009 | 04:37 PM
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I will try this after work. Very good direction thanks man. Sorry for the confusion. Only one of the holes for the scres has a thread hole behind it the other is just the hole and nothing to tap into. It looks like the person who changed the rotors before me only lined up of the screw holes the other is backed by the hub I beleive. Btw this hapened outta nowhere. Would that explain the acrew braking?
Old 06-30-2009 | 04:50 PM
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Originally Posted by blamerobb
I will try this after work. Very good direction thanks man. Sorry for the confusion. Only one of the holes for the scres has a thread hole behind it the other is just the hole and nothing to tap into. It looks like the person who changed the rotors before me only lined up of the screw holes the other is backed by the hub I beleive. Btw this hapened outta nowhere. Would that explain the acrew braking?
You can put the rotor on the hub in 5 different ways (5 lugs) but only 2 of those 5 will line up the proper holes for the Phillip screws. I suspect that your rotor was installed in one of the other 3 positions. That's not a problem if the screws aren't used. But if someone messed up one of the screws, and the remnant of the screw is sticking out of the hub face and the hole in the rotor for the screw isn't sitting on top of it to stick through then the remnant is going to prevent the rotor from seating on the hub face.
Old 06-30-2009 | 05:22 PM
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Will check to see if there is indeed screw remains in there. I think it's the hub. A new hub is 240 at the stealership
Old 06-30-2009 | 08:35 PM
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It is my hub. Just as i suspeceted. So i just took off my rotor and left the hub on. When i spin the hub while its still attached to the rotor it grinds and stops at about quarter spin. It also has a bit of movement. Woooohoo that i found out whats wrong. No woohoo for the $227.40 hub
Old 07-01-2009 | 10:05 AM
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So where can I get a hub for a good deal??
Old 07-01-2009 | 11:26 AM
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Is The hub a sealed unit? or can you access the bearings and races? With the car in the air and tire on, can you "wiggle" the rim?

I Had a similer problem on my RX7 when the bearings went on one of the hubs (forgot which on, was years ago!) felt like the whole wheel wanted to come off under lateral load...


It sounds exactly like a bad bearing to me. If its clunking real bad then it sounds like the bearing has turned to dust....hopfully the race is not spinning inside the hub cause then you'd need a new hub...... Good luck either way man!
Old 07-02-2009 | 12:14 AM
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Originally Posted by gloko
Is The hub a sealed unit? or can you access the bearings and races? With the car in the air and tire on, can you "wiggle" the rim?

I Had a similer problem on my RX7 when the bearings went on one of the hubs (forgot which on, was years ago!) felt like the whole wheel wanted to come off under lateral load...


It sounds exactly like a bad bearing to me. If its clunking real bad then it sounds like the bearing has turned to dust....hopfully the race is not spinning inside the hub cause then you'd need a new hub...... Good luck either way man!
thanks man...i picked up a new hub today. i couldnt install it though because i couldnt get the screw off of the rotor so i need to get my hands on a drill tomorrow
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