Have given my S-Max for inspection with the words please change brake fluid, brakes themselves must be still in order (since I had measured them at the tyre change about 1500 km before). At collection it was said that the blocks were still in order, but the discs would be with 8.9 mm below the wear limit of 9.0, I should absolutely let the before the next bigger ride change. They immediately, however, did not dare to change them. I just measured: 9,15 9.35 approx. 8 mm further inside 9, 55 – 9.7 everywhere else (I can’t measure the inner 1 cm) Measuring medium: Digital slide gauge with two carefully aligned M3 nuts for bridging the bead, repro. 0.02 mm. Questions: 1) Does the thickness count at the thinnest place or the average? 2) Do they make any deduction for measurement errors in the workshop?