Another thing you can do is to go to the auto parts store before you go to the mechanic and buy a set of rotors from the store and then ask the mechanic to replace your rotors when he does the brake job. It should only be a matter of loosening a couple bolts, so don't let him charge you an arm and a leg for the labor.
Shaking when breaking at high speed (e.g. highway) may also be caused by misalignment. Learned this the hard way.
98 Expedition, about 2 wks ago when i pushed the brake pedal suddenly it felt like the pedal was pushing back against my foot. It became worse. Well, i replaced all the brake pads, but it feels like my truck is hopping. Rotars don't look warped. Could it b the rubber line from the body to the caliper?
Yeah that's definitely true. I've never experienced that though.
Also, uneven lug nut torque can cause uneven rotors. (Hopefully) All you need to do to in that case is re-torque your lug nuts.
That's good advice. Just don't slam the brakes too hard :) Thanks for stopping by.
Vibration is more likely caused by uneven deposits of pad material on the rotors. You should slam on the brakes several times from high speeds to try and clear up the surface of the rotors before buying new ones.