S430 Mercedes - Front end shaking at 55+

Does the front end shake all of the time? or only when you apply the brakes?

stop speeding,limit is 65,front end is going to fall out at hi speeds

Front wheels out of balance or out of round
Front wheel alignment faulty
front suspension joints worn
steering tie rod ends worn

Very little info for a fix. Tie rod and upper ball joints do not make a front end shake. Lower ball joints wear out before the uppers do.
Front end shakes at what speed, if you have a broken belt in one of your front tires you will notice it more at low speeds. Mud or snow stuck in wheel will make them vibrate at speed. Lug nuts tight since front end work? You need to give more info. Switch front tires with back tires. If shake is in steering wheel it more than likely is front end but if you feel it in your seat it is more than likely in the rear of the car.

Shake the steering wheel it should free the key up. the wheel lock gets jammed sometimes.

It sounds like you may have more than one problem here. First I would investigate Front End Alignment and ALL Steering/Suspension components for excessive wear and/or looseness. Second I would Inspect the Brake Rotors and Pads for uneven wear. Third I would check the Tires for uneven wear and balance. Many things can cause these symptoms: Worn out Ball Joints, defective Shock Absorbers/Struts. Worn out Tie Rod Ends, Idler Arm, even the Steering Gear Box can be part of the problem. Brake Rotors and Tires can be out of Balance with either one causing the problem over 60 MPH. I strongly suggest having your vehicle inspected by an ASE Certified Front End and Brake specialist immediately. It is very dangerous to drive a vehicle with these symptoms.

Does your steering wheel wobble at parking lot speeds, or your ****. If either, you have a bad tire, have it checked ASAP. (if steering wheel wobbles its a front tire.)

If the u- joints are loose, yes, that would cause the front end to shake.

try to replace the wheel bearings.

HI ,here are some comon isues for your problem ,tires must be in very good condition and balanced by a recogniced shop ,Before you perform a wheel alignment check the auter tie rod ends ,any litlle wear will make your car shake .Good Luck