MOT’s

AdrianC

MinuteNoodles said:

marlot said:

The more normal advisory for brakes is surface corrosion on the disks - which usually means a new set of disks is needed.

No it doesn't, it never has unless the car has been stood for a year or it's been driven round for months with shot pads or a sticking caliper with one side not working. It's a money spinner and one you can avoid by taking the wheel off, going over the centre hub with a wire brush, getting a hammer and tapping the rust coloured dirt and crud off the outer edge as you rotate the disk then painting both of those surfaces with some hammerite. Other than the wear on the surface the pads contact they'll look like new.

MOT testers advising for corroded discs is actually a fairly new phenomenon because years ago when I was a main dealer mechanic it was part of a service to knock the crap off the outside edge of the discs, clean up the hub area with a bit of emery paper and use copperslip on the mating face with the wheel, none of which are done today.

"Corroded discs" is usually a sign of stuck caliper sliders and shagged pads.