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My steering vibrates at high speed braking. I suspect my rotors are bad. Is this so? or do I have a problem in my front suspension?

Bro I have the same model car....my opinion is that your rotors may be bad/warped, however you should also look at the possibility of bent tyres or rims
Have these things checked first as they are easy to diagnose
If all is well with these things then look at your suspension parts

I suspect you have warped rotors.

i have the same problem but its sometimish, i changed my front disc pads cus it needed changing anyway and it eased up a bit . The other thing is that on the steering rack there is a bushing that can be adjusted. I had adjusted it just alittle to see if it would help and it did so i think that primarily its just an adjustment on that bushing to be made. When i do it i'll let u know if that was the problem.

how much for a pair of front rotors

yep most probably you have bent rotor discs , if when youre driving and when the brake is applied you feel sort of a hop on the pedal then you have the possibilty of a warped rotor , my advice is to change it asap because this could lead to other problems due to vibration and hence cause your steering rack and other links to shorten their life span . my advice is not to buy any foriegn used rotors , first you should carry it a machine shop and see if they could machine them if they arent warped too much . otherwise new ones are my first choice .