The first thing you can do is to connect a monometer to the compressor and start the compressor by applying a voltage of 12 volts to it, to check how much pressure it creates. At the same time, you can check the suspension compressor for leaks at the joints with suspension lines and the dryer with the help of a soap mix.
In Land Rover/Range Rover Sport, Land Rover Discovery and Range Rover cars, they install Hitachi suspension compressor and in Land Rover Vogue – a Wabco compressor is installed. In Hitachi compressors, the dehydrator cover often breaks, so part of the air comes out of the suspension system and the necessary pressure is not created in a result of that. The problem is solved by replacing the cover of the dryer. You can order the original cover, and you can install a more reliable thickened cover on the service station.