Brake Rotor On Chevy Malibu?

[humantouch_fan]

OK SO I LET MY NIECE BORROW MY CAR A FEW MONTHS BACK AND NOW WHERN ON THE HIGHWAY AT SPEEDS OF 60 OR BETTER WHEN I HIT THE BRAKES THE CAR VIBRATES (ALOT)
IM THINKING BRAKE ROTOR BENT. i AM A MECHANIC JUST NOT A CAR MECHANIC SO i CAN PROBABLY FIGURE IT OUT BUT WANTED SOME EXPERIENCED INPUT. 2005 CHEVY MALIBU...THANKS

 

[i like to eat food]

rotors are warped, replace them

 

[buck]

definitely sounds like warped rotors.

 

[N e]

time for new brakes and rotors

 

[Marion C]

first of all, dont hit the brakes going that fast because that will warp your rotors. second, sounds to me like your rotors are warped, just a bit that you dont notice it at lesser speeds but at high speed, everything is to a much higher degree.

I would check the front wheel alignment also, something could be loose and making the suspension dance around.