If you have to use speedbrakes on approach, then you need to be grounded until you can plan your descent more accurately.
I have never ever heard or seen any pilot use speedbrakes during approach. It's not recommended by Airbus or most aircraft manufacturers.
As one of my instructors said many years ago... 'Speedbrakes are a paid part of the aircraft, so why not use them if necessary.'
As for the last sentence of
Aviophages statement; Sorry, but I have never heard such nonsense (and not seen in ANY of the manuals I have had the pleasure to study in my carreer).
Regards,
DBate