FL2 Rear Disk Pads

[superhet]

I had my FL2 serviced by NRMA last week and they told me that there was only 2mm left on the rear disk pads.
I had this happen with a previous car (I can't remember which one but not a 4x4...) and when I purchased new pad the pads were only 4mm when new.
Does anyone know what the pad thickness is on the rear pads?

[bsperka]

Usually starts around 12mm for brake material. At 4mm candidate for replacement;.definitely at 2mm.