Can someone please tell me what is the minimum value the 'service brake reading' on a WOF sheet can be when the use a roller brake machine. I found on NZTA web site that 50% was the minimum but not what the numbers from the roller brake machine are. Mine were 260 & 280 and the inspector has ticked the brakes as passed but then failed me as he reckons the rotors need replaced (which I'm about to get checked by a mechanic but I checked myself and they are 0.2mm below the maximum (1.8mm above the minimum) value as stated in the workshop manual).