Is it all the time, only when you brake, only in the mornings or when it has rained? Is the pedal pulsing when you hit it?
-If it's all the time even while driving and you're sure its the brakes, you either have a locked up caliper or something stuck between the rotor and pad. if the caliper is locked up replace it, the rotor (I recomend both sice you'll be changing the pads) and the pads. If something is stuck, depending on the damage you may not need to replace anything or you could have to replace rotors and pads.
-If it's not all the time, your caliper is fine and it's the pads or rotors. I recomend replacing both at the same time anyways.
-If the pedal is pulsing you have warped rotors and should repace them and the pads.
Hopefully that helps you.
Also, you dont have to go with the most expensive parts out there, but keep in mind the brake system is what keeps you from going into the back of the vehicle ahead of you, you shouldn't go cheap on it.
Last edited by BKohs; 11-29-2013 at 10:31 AM.