My 98 k2500 with vortec 7.4l has hydroboost brakes, and at idle and just above idle rpm, it has no power assist in the steering. Even in neutral while revving the motor. Once moving and rpm increases, the power assist returns. Is this a sign of a bad pump, or weak pump, and are the power steering pumps the same for hydroboost and non- hydroboost equipped vehicles? Would fluid contamination be a possible cause of this?
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