Have your front wheel bearings checked. happened to me in the past.
When they did the brakes did they put new break rotors on if not your rotors could have gotten warpedGreat site so far. Got a 1995 Explorer I bought 10 years ago, got less than 70,000 original miles . Hoping to get some help with my steering wheel shaking at 50 mph. I just had the front brakes done about month ago. This was the first time I took it on the freeway since having the brakes done and that's when the shaking started . Any input would be appreciated .