Wheel and brake pedal shake

etx

I've been searching the forum for days looking for any leads on this issue.

I picked up a 2010 Sport with Akebonos up a month or so back. It shakes really bad when I brake above 40 mph. Ok, no big deal I'll do the brakes and rotors.

So I replaced the front rotors with the slotted drilled rotors from Z1 here:
https://www.z1motorsports.com/z1-pro...no-p-4517.html

And I also did the pads all the way around with stoptech pads also from Z1. I flushed the brake fluid and replaced with DOT3 as specified by Nissan.

It was all good! For about a week and a half. Then the shake back back slowly. About a week into it starting to shake it's about as bad as it was the day I brought it home. Now I find out Z1 does not warranty the damn rotors.

I also just replaced the tires with michelin pilot super sport. It's still shaking bad.

I just ordered a rebuild kit from Z1 and I'm going to try to rebuild the calipers and turn the rotors. I really really didn't want to turn my rotors but apparently I have to as Z1 has NO WARRANTY. I'm probably not going to be buying anything from them again.

Anyways, I'm just curious if anyone has had this issue and what else I should check.

Edit: I should add I did immediately take the car out and bed in the brakes after installing them. Did 6 pulls up to 60 and down to 10 mph. I tried bedding them in again after the shake started coming back and had no luck getting it to go away.

I just DD the car about 20 miles a day to work and back. No track time.

We just had it on a lift at the tire shop and the wheels spin freely so I don't think it's a stuck piston.