Wheel shake:rotors
 

Lots of wheel shake when braking over 50km/h, pads and rotors aren't old but are slotted and apparently it is common for slotted rotors to warp and cause wheel shake..just cheap eBay ones, however the shake also happened before I changed rotors, so before I change them again just wondering what else could be causing the wheel shake? Tires balanced and road force balanced..rims brand new last year, tie rods are about a year old. ALSO, there is a little wheel shake when driving around 120-130km/h so if it was my rotors why would there be wheel shake when not braking???

Take a look at your calipers. It's possible. I've actually seen it several times. Doesn't matter if new, used, x amount of miles. I've seen calipers go bad right out of the box. Car would start to shimmy down the road. And yes, it doesn't matter if you're not braking. The caliper starts to lock up (not release).

You're saying the calipers could be the problem, not the actual pads or rotors?

Yes. It's possible. Like I said... I'd give that a look also.