ok idk what the hell is going on...but everytime i press my brake like when im going about 20mph or so...then i press my brake to slow down it vibrate...whats the cause of this? is the rotors warp or the brake pads are warp? or 2nd my back struts are gone its like when i hit a bump it bounces....QUOTE" this is not my car its a friend car"

 

Does the steering wheel shake? Do you feel vibration through the brake pedal? If so, most likely the rotors are warped.

 

i feel it threw the pedal

 

if you feel it thru the pedal the back rotor(s) are most likely warped. if you'd felt it in the steering wheel its likely that the front(s) are warped

 

pedal vibration can indicate front OR back rotor warpage. Usually rear discs are not prone to being warped because of the 70-30 brake distribution in fwd cars. It is possible, but unlikely. To eliminate rear disc warping, try applying the handbrake slightly while driving, if u feel a vibration when applied, the rear rotors are warped.

 

^^ make sure you check that your ebrake releases before you do that while driving though. as most new england member know our rear caliper arm assembly and the spring that releases it tends to rust and seize the caliper. not letting it release.