It would help a lot if you told us what truck you have , how old and if possible what hydraboost you have. on the bendix units used on medium duty trucks there is an electrric back up pump for the hydraboost. Smaller gm units used an accumulator. When you talk about pump I assume you mean power steering pump which supplies hydraulic pressure to both the steering box and hydraboost when running. From what you describe it is most likely a power steering pump issue.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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