Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
With increased RPM is there any steering assist?
Did you bleed the air from the system?
Since there is zero assist the next step is to pressure and flow test your new pump to go ahead and rule it out. Then the lines need to be blown out to check for a restriction, preventing fluid flow.
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Thanks for doing that test. This means the rack you installed is faulty.
Did your replacement rack not come with a new pressure control valve?
You did not mention any warning lights or messages on. If this valve is being controlled incorrect where should be a driver alert.