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Powerdown Port Plug(345) Ridewell Hcv HOLDEN-JACKAROO-SWB ('83-'92) Correct suspension condition on thePowerdown Port Plug(345) Ridewell Hcv Height control valves (HCVs) are the brains of an air suspension system. They sense ride height relative to the chassis and control airflow to the air springs to maintain the correct suspension height under varying loads. A slow, sticking or failed HCV means the suspension cannot respond quickly enough to load changes eliminating the load distribution, ride quality and tyre life benefits that air suspension is