Most trucks come with the suspension dump switch, however this is one of the few that did not come with the option. I am going to show you how to do this yourself and what you are going to need.

This will work for any Freightliner Cascadia 2009 through 2017, I believe the newer Cascadia is controlled with an electronic switch so this will not work.

You will need a dash switch to control the lower and auto , you will need a new height leveling valve, approximately 25 feet of 1/4 inch air line, an air line fitting with a 1/4 OD and I believe a 3/8 thread.

This is simple setup that can take you a few hours to do on a Saturday.