Describe the internal operation of a spring brake chamber during a manual caging procedure.

1. The caging bolt is threaded into a pocket in the pressure plate and turned, mechanically drawing the plate and spring back to compress it
2. The bolt is pushed into the chamber to release a latch holding the S-cam
3. Hydraulic fluid is pumped into the caging port to compress the spring
4. The bolt cuts the emergency spring, disabling the parking brake permanently