Word for word sentences from the FCOM 1.27.10 and 1.32.30. (actually for the A319, but I suspect the same....)
Speedbrake extension is inhibited if thrust levers are above MCT.
If an inhibition occurs when the speedbrakes are extended, they retract automatically.
The speedbrakes are actually spoilers 2,3 and 4
The (autobrake) system deactivates when the ground spoilers retract.