Vibration!

[MinionM3]

Hello all,

I recently took my car to the track for the first time - I have a '95 M3 Track car and have been driving on track for a while, but decided i wanted to test out the E92 for a change and see how it stacks up.

I swapped my wheels for the track session and put my "Daily" wheels back on afterwards.

Now, I notice a pretty bad vibration under moderate to hard braking and even sometimes i get shaking in the steering wheel occasionally, almost as if the wheels are not balanced properly. I would think tire balancing, but the car drove perfectly before the track and i didn't run these wheels at the track, so no reason to assume the wheels magically came unbalanced from taking them off and then putting them back on; also the shaking while driving is random - its not consistently at "X" speed or above.

I am thinking it COULD be rotors warped, but, my brakes have less than 20K miles on them (Rotors and Pads) and i know what i am doing at the track so i dont sit on the brakes after an out session, i dont put the e-brake on, i take a full cool down lap, etc...

I dont want to dump a ton of $$$$ into new brakes for that not to be the problem - especially considering my rotors and pads are very new.

Any thoughts/ideas? Anyone ever have something similar?

I suppose it could be suspension bushings wearing - it just weird that it was perfectly fine, no issues whatsoever before the track and now it feels like its going to vibrate apart after the track :-(

[M43S7RO]

I'd say start with the easy solutions. Check lugs, make sure wheels were put on correctly and torqued to spec.

[Solo_M_Tech]

Excessive pad deposits on the rotors maybe? Double tap wheel mounting and torque...

[Nickdm3]

yep. pad deposits. had the same issue. try using the Hawk Blue 9012 race pads for a break in period and it should go away. I believe the web site has directions. then go back to stock.

[MinionM3]

Thanks all! Gonna try some different pads and then back to stock - will see what happens!

[Saandiaago]

Lots of possibilities of course. My personal experience with vibrations after track have been pad deposits and also due to a lower control arm that went bad.

[MinionM3]

Originally Posted by Saandiaago

Lots of possibilities of course. My personal experience with vibrations after track have been pad deposits and also due to a lower control arm that went bad.

I sure hope it's just par deposits - I didn't go off track or anything so I'd hope my LCA's are fine ?? still, another thing to Check