Dump axle question

Hello I just bought a 2017 Wilson commander hopper. It's a tandem axle with one being a lift axle. I am new to lift axles and am wondering if mine is working properly? There a gray box on the front of the trailer where the switch is for the lift. When I switch it to drop my axle down the whole suspension on the trailer drops its air then the axle drops and then everything airs back up...is this normal operation? Thanx for any help!

 

Ok! So then I assume that would be normal procedure for when I lift it as well?

 

Alright thanx for answering my question!