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Originally Posted by BoostedBB6
Suspension will have 0 impact on brake components seeing as they are in fact attached to the bottom of the struts.
alignment can cause a vibration, but when you change your rotors and drive 10k with no more issue but comes back and again is remedied from rotors its very clear the issue is not the suspension. Not to mention G35's were known for this problem from day one and the easy fix was non-OE pads.
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I disagree because of my personal experience. I should have been more specific when I said suspension: steering geometry. There are two main reasons for brake vibration. The first is steering geometry issues and the second is installation or hub run-out issues. Both of these are components of a vehicle's suspension. Steering geometry issue can develop from hitting a curb or pot hole. I have had this very issue on my evo 9.
In my case the suspension was way out of alignment due to steering geometry issues and I developed groves in my rotors as they wore unevenly over time. Again note...this happened over time and wasn't something noticeable immediately. Of course I didn't know this at the time and as such couldn't resolve the issue despite trying different pad compounds until the car got another alignment as it turns out that the settings had deviated substantially due to another issue. This also resulted in wearing down a set of Michelin PSS down to almost no tread withing a 1.5 year time span and less than 10,000 miles. So yes suspension can have a huge impact on brakes among other components.
As per this being a G35 specific issue...you'd know more than me. However the fact remains that suspension can and will have a severe impact on braking. Moreover the OP stated
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steering wheel vibrates under braking, strong enough to be alarming on the highway
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So once again...sounds like suspension related issue to me.