4-22 AIR SYSTEM - Continued
Connect air lines to brake valve. Be sure lines are connected as noted in REMOVAL preceding.
Install both knobs on emergency brake valve.
Start main engine and allow all air tanks to reach full pressure.
Push PARKING BRAKE square knob and check parking brakes release.
Brush valve body and connectors with soap solution. No leakage is permitted. Tighten/remake joints as
Pull PARKING BRAKE square knob and check parking brakes engage.
Push PARKING BRAKE RELEASE knob and hold in. Check parking brake releases.
Release PARKING BRAKE RELEASE knob and shutdown main engine.
Install air panel in dash using screws (1) and washers (2).