Another question for the experts for my 2004 Fiat Scudo van 2.0 Jtd. No problems with brakes, just wanted to know how the auto adjusters on the rear drums work. I understand they ratchet slightly to make the shoes move outwards closer to the drum to take up wear. But what makes them adjust - is it each time the handbrake is used, or each time the brake pedal is pressed?