I just want to make sure I understand he parking brake correctly on my M923-A1.
It is spring activated, so when you 'let off' the parking brake air pressure is applied and deactivates the brake. When you apply the parking brake the air pressure is released the spring mechanism takes over and applies the brake.
This is also a fail safe for loss of air pressure, because then parking brake automatically comes on. Did I figure this out correctly or am I way off base?
If it's the same as spring brakes on 18 wheelers, then yes, you are right. Do you have to press a button to release the "parking brake"? If yes, then you are right about the brakes.
__________________
Steel Soldiers: That others may drive.
You are close . the parking break stays released till air is lost or it is reaplied, it does not operate your service brakes. there are 2 chambers 1 is for the parking break. the 2nd is for your servce brakes witch is operated by a seperate air diaphram. that operates the service brakes.
I didn't see where the OP said anything about service brakes in the first post. Air bleed off, whether by switch or by accident, enables the parking brake. Applying air pressure releases the parking brake.
Parking Brake - Air
