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You're right, I'll go edit it, so that someone in the future doesn't read incorrect info.

Even though they push through the same shaft, think of them as not being connected. You have two completely separate ways for the brakes to be applied. (I'll lay it out here for others that might come looking.) 1.) Service brakes: When you push the pedal, it lets air in the service brake...

The spring brakes apply less pressure than the air brakes can. The springs brakes are never used to stop the truck under normal conditions... they are continuously held disengaged by air pressure, once you pull that parking brake knob.