They are superficially corroded but it appears there is very little actual metal wear with no lipping - typical of underused rear brakes on a light car. If you feel comfortable at handling a possible rear wheel skid I would use the handbrake more often when slowing down to wear off some corrosion. I've never driven a Jazz so I don't know how effective the handbrake is but it's usually extremely difficult to lock the rear wheels. However, I'll probably be reprimanded for this suggestion :-( They will almost certainly pass the MoT, unless there is something wrong with the calipers or the pads are worn down to the metal back plate.

Edited by John F on 12/07/2019 at 22:44

They are well corroded , but not bad enough for an mot failure, unless they are cracked or breaking up. Very likely to be ok on the brake rollers . However, I’d like to see the other sides , they could be a lot worse.

I could have pretty much guaranteed those would have failed an MOT in Edinburgh in the 80's / 90s, because I ALWAYS failed an MOT for rusty brake disks in Edinburgh in the 80's / 90s, even though they passed the brake function test, and had been replaced for the previous MOT.

This was my main reason for thinking the MOT was a bit of an arbitrary rip-off charter. Don't miss it at all.

Here (in Taiwan) there's no visual inspection, just a brake force test, so cosmetic failures don't, AFAIK, happen.

Eventually I took to putting a shiny set of disks on for the MOT and then putting the rusty ones back on afterwards, wrapping the shiny ones in aluminium foil and grease-proofed paper for the next MOT..

A bit of brake application won't, IMO, save them.

If I had to get Scottish disks through an MOT again I'd try electrolyisis.

Edited by edlithgow on 13/07/2019 at 12:43