1997 Subaru Outback low mileage smells and very low mileage

HI my car was vibrating violently when I braked at 65mph. My mech said it was because the front brake disc was bent and got it replaced and it solved the vibration. But the acceleration is still bad. It feels as if the brakes are on just like before. The front wheel has a burning smell after driving and the milage is 13mph. Which is bad.