Brake pedal shakes when braking at or above 50 mph?

[mrtwo]

I 've noticed this problem for quite a while. The brake pedal shakes (vibrates) when braking at or above 50 mph. It happens every time i go down a long slope or on highway. The streering wheel shakes a little bit too. It does not happen below 40 mph. I change the brake pads (front) this march and it did not fix the problem. So what can be the problem? Thanks.

[hueroloco]

your brake rotor runout is excessive. basically they're warped.

[mrtwo]

Then what work needs to be done? Replace the rotors or resurface them? Thanks.

[Mike Gerber]

Originally Posted by mrtwo

Then what work needs to be done? Replace the rotors or resurface them? Thanks.

You are correct; resurface them if there is enough meat left on them (wherever you take them to be cut will check the thickness first) or replace them with new ones. If there is plenty of pad left, just sand them lightly so they will seat better to the new rotor surface.

Mike

[jtoyotaman]

most places dont turn rotors anymore go ahead and buy new ones, and replace pads again, dont buy pads that have lifetime warranties because they are made so hard they will actually wear your rotors out before the pad itself.