At first I thought is the aircon, so I turned off the aircon and experiment it, but I still heard that 'tock' sound.
Jo_Lee, my case is similar to urs, did u check with TCM?
i have that sound oso, i've check with TCM, they say is the ABS brake, when u park the car for too long (10 hours or more) then u start the car, it got the sound "tok" is bcoz the ABS brake is working,
if u dont hear the sound, that mean some problem with ur brake, that is what i'm told.