When the emergency brake release is used and not reset, the brakes will not lock to the floor and functions like elevation will work. To reset the emergency brake release function the following two things need to take place.

First: The Emergency Brake Release valve must be closed and tightened (counter-clockwise) before activating any hydraulic function. 

Second: The BRAKE UNLOCK button on the pendant control will have to be pressed before the brakes will lock again.