6hr break rule?

Thank you and few questions more . Can i take - 6hr work - 15min break - 2hr work - 15min break -30 min work ? Also If I work 8.5hr shift but I take my 30 min break after 6hr following by 2.5hr work but I have driving time 4.5hr after my last break I need to take another 30min - that’s correct ?

Also I forgot - yesterday I worked 6hr with 30 min break following by 2.5work and finish but when I check my digi tacho show me pause symbol=15min not 30min ?