I have an 03 G35 Sedan, and it started vibrating when braking about two months ago, I suspected on the rotors, and replaced the front rotors and pads, but still the same thing. I haven't replaced the rear rotors yet, which look good, and the vibrating feel like it's coming from the back...so I was just wondering if someone has any experience with a similar issue?
I am doing the rear pads and rotors this weekend, and it only vibrates when braking, no other times at all at any speeds, so could it be something else, or it's defenitively just rotors???

Please and thank you in advance

 

Alingment....

 

it most likely is alignment because it is trying to brake straight and so its turning the wheels to make it straight or in what other direction you wanna brake at that's why

 

its ur rotors and/or pads 100%, its NOT the alignment. had this problem many of times on many different cars when the brakes were down. just replace them and u'll be fine

 

Yes, alignment. 99% of the time, your alignment will NOT cause a vibration at all. If it only vibrates under braking, and you can't feel it in the steering wheel, rather more in the chassis, it's the rear rotors.

 

I wouldn't go as far to say as 100% but if I were betting money. I would put my money of rotors.

Have you recently installed lowering springs in your car?

 

I had the same problem, took my car in for an alignment, problem solved.
I rather spend 50 dollars on alingment rather than more money for new rotors if they are fine.

 

sounds like rotor warp

 

Thank you all....I was suspecting the rotors....but I will also align it...
No lowering or anything like that, it's bone stock, with a CAI...but I still love every inch of her...
Again, thanks!

 

I dont quite get how alignment could affect vibrations? Im having the same problem. i installed a bbk, and i changed my upper a arms as well, and didnot get an alignment. Gonna get it checked out today

 

I have the same problem, my alignment is good though. So im suspecting its the rotors.

 

what kind of rotors did you get? I got a set of r1 concepts brand new, installed them and my car would vibrate like that. Found out that the rotors were warped from the get go.

 

i got stoptech rotors, they were used for 3 months

 

they probably need to be turned...most people on boards like this rock their brakes pretty hard which causes hard spots. Eventually the rotor begins to warp. Have them turned and it will go away. Don't forget the rear brakes as well. Sometimes a vibration can come from back there

 

hmm i see, but the owner told me he never had any problems with them. No vibratiosn at all?