I opened up my 53,000km 2000 suzuki grand vitara V6 rear brake drum to inspect the brake shoe lining. It still has 4mm brake shoe material thickness left. Is it safe to keep on going without replacement? I would really like to replace the brake shoes myself if necessary, but it looks pretty darn complicated. The center hub seems to be blocking most access to the springs & assembly. And I dont have any suzuki service manual. The front brake pads are 5mm thick and looks pretty easy to replace, so I will be doing that myself.