B737NG Brake logic
 

It is said, that after around 8h the pressure provided form the brake-accumulator is exhausted. Does this mean the parking-disks went back in their resting positions or does it need to lift the parking-brake handle on the TQ to release brakes? This could be a scenario for instance towing a airplane to another position without activation of APU.
Background: Question for parking-brake logic in a Flightsimulator.