Earlier quoted context omitted.
>> boil down to surface rust on the braking discs You don’t fail for surface rust, it’s not a check that’s done. You fail for dangerous imbalance of braking force. When the car is run on the drum roller (rolling road powers the cars wheels) and the inspector presses the brakes, the braking force applied by the car is measured. You get a fail if your braking performance is likely to unsettle the car in high braking fo…
The manual clearly states that the breaking discs need to be cleaned every, what was it, 25k km. Thats a job for a mechanic. Also in the DIY section it says that the brakes should be burnished as well.
If a workshop has to do it the rust is quite bad and there are groves. Otherwise you can use the pads.