hey guys i have a 2003 f-150 x cab fx4, i am currently having a vibration that i can feel in the seat while braking, i replaced the rotors and pads, shoes and while back, apx 3 mos ago, with the best advance auto sells, i had my tires balanced and rotated, and i took it to my mechanic, and all he could find is a ebrake slide that was siezed, and he told me everything was tight in back? please help i drive apx 200 miles per day for work and i cant take this shaking anymore