something is wrong with my car

[Dreamspeed]

Something is wrong with my car. When i step on the brake pedal the pedal starts moving up and down (vibrating) however if i step on it hard it doesn't move anymore. This started happening after i got into an accident in which the front right side of my car hit the guard rail on the freeway ( resulting in a smashed fender and bent rim). First i thought that the rotor was warped so i had it machined the problem was still there, so i put in new rotors and brake pads but that didn't work, lastly i changed the whole right knuckle along with the hub and everything and the problem is still there. I tried driving with two different sets of rims and i had a alignment check but the problem is still there. Does anyone have any idea what could be wrong? I'm completely lost now. any help would be much appreciated thanks

[commercetx]

What about the drive shaft/axle? If it is a front wheel drive.

[SiN-6]

Something is wrong with you too, try just post ur question ONCE and in the right section..its very annoying to post all over each board

[Clark Kent]

I think you need a alighnment done, and balance your tires, it should be that, but if not it can be that your cambers got jaked up and need new ones. I suggest that due to I had a similar problem on my brothers car.

[Solo]

try this, coast your car at like 15mph in a straight
direction and dont slam the brakes but be aggressive on
em and let go of the wheel does the car pull to one side?

[robert]

maybe it is a bad hubbearing