I've been told by an authorised Mercedes service engineer that all 4 discs and all 4 pads need changing on my Mercedes GLC 43.
It's just over 2 years old with 30k miles on the clock, so I am pretty surprised about this! They sent me this video of the inspection which does show some corrosion, but others seem to think this is perfectly normal:
They're also telling me that pads with 8mm on them need changing... which definitely doesn't sound right.
It went in because of a very occasional braking issue - brakes suddenly feel extremely heavy and it's difficult to depress the pedal. That has happened twice, spaced apart by weeks. My opinion is this can't be caused by either pads or discs, either of which would produce a consistent and less dramatic decrease in braking performance. It strikes me as more likely a hydraulics or system management issue, but they refuse to look at anything else until I replace the discs and pads.
Am I being ripped off here?