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Old 09-14-2017, 05:50 PM
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Rotors spin on hub even when tight?

I gave myself a brake job about 6000 miles ago - rotors and pads all around. all seemed cool, but I *thought* I noticed the traction control kicking in a bit more. otherwise, drives like a champ.

I recently rotated the tires, and found the wheels will freely rotate after tightened. it doesn't take much torque. the rotor lug holes are not significantly more oversized than typical...

I had to beat the old rotors off with a hammer. so when installing the new rotors, i put a dab of antiseize on the backside - something I have done with minis and BMWs for a long time with no complications. it was permatex, gobbed in place, wiped around with a paper towel and scrubbed off - just a film left on surface.

I tighten the wheels to 90 lbs...

if i roll forward, and slam the brakes, i can hear the rotor rotate and lock into place. this happens once when rolling forward - doesn't repeat because the wheel is loaded into place. i can then do it in reverse and get the same results... minis have a set screw - my BMWs do not, but have less slop in the lug hole.

what's going on - and how do i stop it? it's acting like the wheel lug torque isn't adequate to hold the wheel in place. is it wrong to grease the rotors on these things?

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Old 09-14-2017, 05:52 PM   #2
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Where did you get the rotors? Sounds like they are out of spec..

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Old 09-14-2017, 06:04 PM
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they're Evolution Power Stop - a crappy kit i bought from amazon. i needed a full kit ASAP, and no locals had the rotors - these were available overnight so i could do the job that weekend... so i bought 'em.

that said - rotors typically have oversized lug holes. i did not overlay these with the last set, but would be surprised if they're really out of spec...
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Old 09-14-2017, 06:31 PM   #4
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The set screw is just to help during installation so they don't fall off. Lubricating a surface that is not supposed to move, at all, was not a good idea. The rotors rust to the hub seal... in the years and 10,000s of miles in between rotor changes, I don't know if grease would even last...
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Old 09-14-2017, 07:19 PM   #5
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Something is wrong. Your rotors should not move with the wheel torqued correctly. It sounds like something is holding your wheel out from the hub. Corrosion maybe? Change your lugs or something? Maybe they are bottoming out internally before the wheel is tight? I'm not sure but something is wrong and needs to be looked at.
Sure it's not the pads shifting in the brackets? Pad clips warn or missing?
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Old 09-14-2017, 11:05 PM   #6
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Quote:
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Sure it's not the pads shifting in the brackets? Pad clips warn or missing?

This

I read and re read the OP. It's just not a possibility. The hub would only shift inside the rotor IF.......big IF......the rotor lug holes were not only oval-ed out but had to be considered notches more then holes, THEN, the wheels be torques less then finger tight and after all that only when changing direction from forward to reverse. Not each application of the brake.

Sounds like you have a pad shift inside the bracket, or the slide pins are loose or missing a bushing at the end of the one of the slide pins allowing it to bounce around in the hole. Next possibility I can thing of is extremely wore out ball joint.

Finally option, I am just not reading correctly what you are trying to convey .
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Old 09-15-2017, 05:33 PM
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Originally Posted by BeyondYourFrontDoor View Post
The set screw is just to help during installation so they don't fall off. Lubricating a surface that is not supposed to move, at all, was not a good idea. The rotors rust to the hub seal... in the years and 10,000s of miles in between rotor changes, I don't know if grease would even last...
right - i didn't think the set screw mattered at all. part of why i'm asking about this. i never thought it did - should only be wheel surface pressure to hub when torqued.

lubricating the surface is (from my experience) quite common. i don't know about your environment, but where i am, unlubricated rotors seize to hubs within a year. my last set of tires were actually used when i put them on, and i had to beat them off with a hammer after about 20k...
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Old 09-15-2017, 05:41 PM
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brain fart: in my last post i babbled something about the tires and mileage and the rotors seizing - i'm sick and semi delirious - equating tires with rotors. don't try to make sense out of that - it's straight up stupid.

Quote:
Originally Posted by RichL35 View Post
Something is wrong. Your rotors should not move with the wheel torqued correctly. It sounds like something is holding your wheel out from the hub. Corrosion maybe? Change your lugs or something? Maybe they are bottoming out internally before the wheel is tight? I'm not sure but something is wrong and needs to be looked at.
Sure it's not the pads shifting in the brackets? Pad clips warn or missing?
yes something is wrong - totally agree. for what it's worth, pad clips went in no problem - all seemed like an OEM change. i can disassemble and take a closer look.

regarding corrosion - the surface was certainly... ugly. but nothing worse than i've seen before. i cannot count the number of times i've changed brakes, and this is a first. i just have a hard time believing the surface was so craggy it'd result in this - but it's worth cleaning it up.

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Originally Posted by mrsuthern View Post
This

I read and re read the OP. It's just not a possibility. The hub would only shift inside the rotor IF.......big IF......the rotor lug holes were not only oval-ed out but had to be considered notches more then holes, THEN, the wheels be torques less then finger tight and after all that only when changing direction from forward to reverse. Not each application of the brake.

Sounds like you have a pad shift inside the bracket, or the slide pins are loose or missing a bushing at the end of the one of the slide pins allowing it to bounce around in the hole. Next possibility I can thing of is extremely wore out ball joint.

Finally option, I am just not reading correctly what you are trying to convey .
the rotor holes are perfectly circular. the concern i had is that now i've paid attention, they seem bigger than i'd expect. i see about 1/16 - 3/32" around each lug. i'll look at the pads too - it sounds like i just have to break them down and inspect.

i was hoping someone would have a "Oh! That Common Problem!" response for me...
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Old 09-15-2017, 06:09 PM   #9
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the holes are bigger that is normal. the rotor will move a bit until the lug nuts are tightened down. I think you have something else going on.

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