Ok, so I bought my Elantra and I was happy with it. But I noticed while cominf down BWI that when ever I go over 40mph and I have to hit my breaks my car will start shaking. It's strongest at my stearing wheel. I don't know it's tire alignment or if it's something to do with my breaks.

Also, the car jerks if I keep my foot on the break when I'm slowing down from 40+. It feels like I keep tapping my breaks, but I'm not.

More than likely, your brake rotors are warped causing the pulsation. Most any shop can do this repair.

Ok, so I bought my Elantra and I was happy with it. But I noticed while cominf down BWI that when ever I go over 40mph and I have to hit my breaks my car will start shaking. It's strongest at my stearing wheel. I don't know it's tire alignment or if it's something to do with my breaks.

Also, the car jerks if I keep my foot on the break when I'm slowing down from 40+. It feels like I keep tapping my breaks, but I'm not.