Yesterday, I was driving and went over a slightly ruff part of the road. Shortly after the steering wheel started to shake back and forth. I pulled off and did a walk around and inspected all the steering components and nothing was showing. The pump did start making noise when steering almost was at lock. I was wondering if the pump could be going out. I was just down the road to my house so I went back and used another vehicle. On the way back, it was fine . Not chancing it tho. If the pump was not working, would the steering shake when driving over ruff road at low speeds? Thanks.