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Powerdown Universal Height Control Valve Kit TOYOTA-LANDCRUISER-40 Series (Small Eye) (1969 to 07/1980) (Shorty 40) Tough Dog leaf springs designedPowerdown Universal Height Control Valve Kit 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