What's up guys, I'm really a bit lost on this one. 2006 G35x 104k on it, my steering wheel and front brakes were vibrating and shaking when braking at highway speeds. Also made some squealing noises so last week I replaced all rotors and pads with Raybestos Element 3s myself. Replaced a compression rod and other lower control arm the day before so I got an alignment, wheel balance, and tire rotation done. Brakes felt awesome after, no shuddering at any speeds or shaking. Drove about 130 miles on the highway last week and 70 yesterday. Was coming back home 70 miles today from a short weekend trip and after some real heavy traffic, I noticed the shaking returned at speeds from around 55-70 mph.

This was my first brake job but there are still no sounds or vibration at lower speeds. The vehicle does not pull to a side when braking and there aren't any abnormal smells. The first 200 miles with the new brakes were great and I noticed on the highway today the wheel shaking started when the traffic finally got moving. My front 2 calipers are newer and all of the pistons compressed easily and I greased the slide pins. With around 275 miles on them now I'm not sure if I didn't bed them in right or what. Did 8 stops of 40-10 mph but these pads are just for daily driver use. Let me know what you guys think, I'm pretty upset about this one.

 

Check your torques, maybe something in the braking system is loose? Would be odd for it to just start after 150 miles

 

Definitely sounds like a bolt is coming loose, main suspicion would be wheel lug nuts.