my steering wheel shakes when i'm braking, the faster i'm going, the more it shakes. The tires were just mounted and balanced, possibly the alignment? There's no vibration even going at 95 mph, but when i hit the brakes the wheel starts shaking kinda violently. Any idea what it could be?

 

warped rotors without a doubt check your brake pad wear they might be low causing your rotors to overheat and warp. if so replace pads and resurface rotors, if pads are ok then just resurface rotors and sand pads a little to rough them up a bit so they wont cause brake squeels when they wear themselfs in.

 

like he said, rotors

 

Yep warped rotors.

 

it could also be that your wheels were not torqued to specs.

when i first installed my coilovers i didn't torque the lug nuts, i just tightened them using german torque specs (gud an tite). i noticed the vibration and when i got home i loosened all my lugs and torqued them down. vibration went away.

it is more likely just warped rotors, though.