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  #1  
Old 10-24-2012, 03:43 AM
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Default B10 Biturbo shimmy/wobble braking from high speed

So like the title says, when I'm braking from anything over 90 km/h there is a violent shimmy (or more significant, like a wobble) in the front end on the passenger side. It disappears as the car slows down.

It doesn't happen if I just let the car decelerate naturally, just with more aggressive slowing.

Control arm? Something worse?
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Old 10-28-2012, 07:44 AM
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have you checked if the rotor looks okay, no warping etc.?
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Old 10-28-2012, 05:24 PM
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They are brand new rotors, and it was doing it prior to the rotor replacement.
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Old 10-29-2012, 09:16 AM
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Did a quick search and found this as a suggestion:

Quote:
Loose wheel bearings cause the rotors to run out of parallel with the pads in the mounting bracket and cause excessive runout.
I'm no expert, but that sounds plausible.
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Old 10-29-2012, 03:04 PM
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Thanks, I'll run that one past my long-suffering mechanic.
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Old 11-01-2012, 11:00 AM
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If you have eliminated run out on the rotors, I would check the thrust arms, there an an upgraded one you can get that uses the bushing from a 750i.

Its pretty easy to DIY, I did this a few years back and noticed a difference.

http://www.bmwe34.net/E34main/Mainte.../Upper_arm.htm
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alpina, shimmy, wobble

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