Rotor set screw coming loose

zro2gon · 08-22-2015, 06:51 PM

Recently had new rotors installed and after a few hundred miles one of the set screws came loose causing the rotor to move around and make noise when going over bumps. Took off wheel and retightened it and came loose again causing rotor to move around. Would replacing with new set screws help?

_bdiddyb_ · 08-22-2015, 08:03 PM

Impossible, loose or not - the 5 lug bolts would have held the disc tight to the hub. Unless you are not tightening the lug bolts to spec.

zro2gon · 08-22-2015, 08:08 PM

I don't have a torque wrench so not sure what I tightened them to but they are as tight as I can get them. Maybe I'll take wheel off again and clean the mating surfaces and see if that will help.

RM7 · 08-23-2015, 12:14 AM

If I remember correctly, the set screw is supposed to be loctited. Was it?

zro2gon · 08-23-2015, 10:25 AM

No it was not. Seems that the problem was with the lug bolts. One is about a quarter inch shorter than the rest. Heading to dealer tomorrow to get them replaced

techwhiz · 08-25-2015, 12:10 PM

That screw does nothing but locate the rotor if you take the wheel off.
It is impossible for the rotor to move once the wheel is bolted up.
Noise when going over bumps is pad rattle, not rotor noise.

08-22-2015, 06:51 PM	#1
zro2gon Private 30 Rep 75 Posts Drives: 2014 bmw 335I xdrive m sport Join Date: Mar 2015 Location: Racine, WI iTrader: (0)	Rotor set screw coming loose Recently had new rotors installed and after a few hundred miles one of the set screws came loose causing the rotor to move around and make noise when going over bumps. Took off wheel and retightened it and came loose again causing rotor to move around. Would replacing with new set screws help? __________________
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08-22-2015, 08:03 PM	#2
_bdiddyb_ Lieutenant 215 Rep 558 Posts Drives: 2013 335i Join Date: Aug 2013 Location: California iTrader: (1)	Impossible, loose or not - the 5 lug bolts would have held the disc tight to the hub. Unless you are not tightening the lug bolts to spec.
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08-22-2015, 08:08 PM	#3
zro2gon Private 30 Rep 75 Posts Drives: 2014 bmw 335I xdrive m sport Join Date: Mar 2015 Location: Racine, WI iTrader: (0)	I don't have a torque wrench so not sure what I tightened them to but they are as tight as I can get them. Maybe I'll take wheel off again and clean the mating surfaces and see if that will help. __________________
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08-23-2015, 12:14 AM	#4
RM7 Brigadier General 2893 Rep 3,466 Posts Drives: Camaro SS 1LE Join Date: May 2015 Location: Alaska iTrader: (0)	If I remember correctly, the set screw is supposed to be loctited. Was it?
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08-23-2015, 10:25 AM	#5
zro2gon Private 30 Rep 75 Posts Drives: 2014 bmw 335I xdrive m sport Join Date: Mar 2015 Location: Racine, WI iTrader: (0)	No it was not. Seems that the problem was with the lug bolts. One is about a quarter inch shorter than the rest. Heading to dealer tomorrow to get them replaced __________________
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08-25-2015, 12:10 PM	#6
techwhiz Colonel 453 Rep 2,973 Posts Drives: e90 335i Sedan - Arctic Join Date: Feb 2012 Location: Bay Area, Ca iTrader: (4)	That screw does nothing but locate the rotor if you take the wheel off. It is impossible for the rotor to move once the wheel is bolted up. Noise when going over bumps is pad rattle, not rotor noise. __________________ Arctic Metallic\CF Splitters, Spoiler, Mirror Covers\LED Tails\LSD\Tinted\Coded\Apex Square SM10-19"\LED Angel Eyes\Gloss Black Grill\Integrated V1 & Galaxy Tab\M-Performance Brakes\Cobb Tuned\xHP Flash\Resonator Removed and -> is your friend.
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