I went to change my front bearing tonite and I noticed that the front disk hub and the disk Rotor were not joined together tightly!
There was Play between the bearing Hub and Disk Rotor if you can believe it. I had replaced the disk rotor myself 4 months ago and evidently the bolts had come loose.
I got a 10 mm Hex head and tighened all of the nuts attaching the disk to the hub.
Several of the hex bolts were a half to one turn loose.
After thinking it over I stopped repairs at that point. i was scared to think that the hub and disk were loose and what could have happened if they had separated at high speed with high braking force.
I am wondering if the play in the hub and disk when they were loose were enough to have cause some abnormal shear stress in the hex bolts or the hub and the disk and whether the whole assembly is Trash.
I mean someday I will be driving across the Verrazono bridge at 80 mph with my family in this car.
Any professional advice? Am i over imaginiing things? Did I fix the problem simply by tightening the hub nuts?

http://mywebpages.comcast.net/snow7ice/BENZ.html

Carrameow,

Those are just one of the many bolts that the manual says to replace with new. If you don't replace them, you should use blue Loctite when you reinstall them

ewstan

I would replace the bolts, loctite them, torque them down and not worry about it. I am making the assumption that the rotor is centered on the hub by the mating surfaces and NOT by the bolts.... If that was the case I would closely inspect the bolt holes in the rotor for "ovaling" that would prevent it from seating correctly. RT

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84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K

I actually had a couple of bolts fall out of one of mine and one of them tore up the hub. It took a while to diagnose the problem, but finally found it. Ended up replacing the hub and the rotor.

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1976 240D
1987 560SL
2007 E320 Bluetec
1998 C280 (now son’s car)
1982 240D Manual - Sold