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The cause of whine and low power assist is air in the system. Leaky O-Ring allows air to be sucked into the pump.
6evil9 - you have air trapped in the system. Let the car sit for several hours. Top up the PS reservoir, jack up the front of the car so the front wheels are in the air, turn them from full left to full right several times without engine running. Top up the PS reservoir again. Repeat turning. Top up. Start engine for a couple of seconds. Repeat the procedures as long as you have air bubbles in the PS reservoir (the mesh filter is removable).
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