When you cage a air brake does service brake work?

Answer 1

If you cage your brakes off the service brakes will work just fine because the brake chamber is two separate parts. The parking brake works trough the service brake but service brakes will work unless the diaphragm in the parking brake chamber is ruptured, holding the brakes on.

Harley

Answer 2

"Harley" gave an answer which showed why people who don't actually understand air brake systems should not be answering questions about them. When you cage an air brake, you are backing off that brake - this will render both the spring brakes and the service brakes inoperable. The service brake will not work 'just fine", because the arm from the brake chamber is backed off, which backs off the slack adjuster, which backs off the pads or shoes (depending on if you're using disc brakes or s-cam drum brakes).