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I just bought an 03 4x4 cummins 2 weeks ago with 94,xxx miles. I know this sounds stupid but it happened. I was driving my truck when I got a flat on the front. I pulled into a gas station plugged and filled tire back up. When i started my truck the p/s was out. When i drove home p/s came back when I was doing 30mph and hit the gas in the corner but goes away when at idle or stop. First thing I do is replace the pump with no difference. Jack the front of the truck up and find no binding in the front end. U joints look fine. The brakes have worked fine other than feeling funny at a dead stop. In other words the brake is not hard like the whole hydroboost system is inop. Please help
