Ever since, i hit a curb 2months ago about 4k to replace everything. The front left brake, is making some bad noises while slowing down, and vibrates the whole car. Thats also the wheel, that hit the curb. I think the rotor has some grooves in it, maybe warped? Car has about 18k miles.

 

bring it in have them check out.
i didn't hit the curve. but i don't know what happend to my car. but i have the simular issue as your. when brake the car shake. if your car does that when you brake the rotor is the first one to look at. i just got mine changed today. and now vibration is gone car not shake any more. if you do it your self you can save a lot of money. take only 1.5hr top to do the job if you know what you doing.
i picked up pro stop brake pads and two front rotors $160 at the auto store.
someone gonna suggest you to get the rotors turn, but think about if it gonna come back in the future? do it once and do right and for the long run.

 

I think ive abused the brakes quite abit. So might as well get 1 new rotor for the driver side, and new pad. Might get 2 new pads. Anyone know any good cheap places.

 

Well took the car to my mechanics shop, nd the problem ended up being the caliper not being bolted on tight enough, causing it to make bad noises, and vibration when braking, and making noised of the pad contacting the rotor even when driving.