[REN69]

Could be crappy rotors, sounds like they're warped already... I'd take them back and ask for a new pair if they're that new, looks like they have a 2yr warranty at least.

I would also make sure your calipers are not seizing... if one side is working fine and the other one is not, it could create contact and therefore heat on one side only, leading to warping.

 

[relee]

You say the vehicle shakes at 60-80 MPH, driving or braking?
If it only shakes at higher speeds but not lower, doesnt sound like brakes.

 

[mustafghan]

You say the vehicle shakes at 60-80 MPH, driving or braking?
If it only shakes at higher speeds but not lower, doesnt sound like brakes.

Braking. It doesn't shake while driving. It has actually gotten worse and shakes pretty badly at around 40 mph too.

 

[REN69]

if you haven't changed the rotors, change them... also have your tires balanced if possible.