so i have this problem. my qx56 2008 steering wheel shaked when i bake at high speeds like 75 miles and up... i already changed the front brake pads.. the brake disc are good.. i checked the back and they are also good.. im waiting till tomorrow monday to go to the dealer have it align, maybe is that.. hopefully is that.. any ideas what it coukd be... also the front right tire is 5 pounds lighter than the rest.. and they are at 40 psi.. and the lighter one is at 35.. but i dont think ks that.. now one of the reason i think it could be doing that is cause about two weeks ago i hit a pretty big dip on the street which sook the car pretty bad.. so thats why im thinking is the algnment.. and it was specislly on the right front tire. so please anybody could help me with.. the car runs and drives grest until u break at high speeds...

Not your alignment. You prob need to have your tire balanced. The tire pressure should be the same in all 4 tires. That could be a problem

Not your alignment. You prob need to have your tire balanced. The tire pressure should be the same in all 4 tires. That could be a problem

ok, cool, i was thinking the same thing, either way when i get to the shop on thursday, ill get both alignment and balance done to it, that way i ill be sure.. thanks anyways.

you say the discs are good? Have you had the rotors on a lathe to check that they are true?

Not your alignment or your tires being out of balance, your front disc are warped, you stated that when you brake, your steering wheels shakes. If your tires are of balance, your steering wheel shake whether you are braking or not after certain speed. Get your disks cut or better yet changed them out. While you are at it, have your steering components checked to make sure there is no damage to the tie rods, rack, sway bar, or sway bar end links since you stated that you hit a bump that shook the truck.