Should this brake disc get an MOT advisory?

[fly]

You can see slight corrosion around the edge and very light scoring. Would it get an advisory for the corrosion?

[SAS Tom]

Looks fine to me, what about the other side?

[Dr Interceptor]

I wouldn't expect an advisory there.

[Hereward]

Looks mint to me. I was more surprised to see the holes drilled so close to the edge.

[ChocolateFrog]

Those wheel nuts make it look like it's lived under the sea.

Maybe the discs looks similar when viewed from the other side?

[sunnyb13]

nope

[snotrag]

If the question really is 'will it' then the answer is no - but only based on what we can see.

If the actual question is 'I've just been given an advisory and i dont agree with it....' then its more likely/completely possible that the inside face of the disc is completely mullered. Very common.

[Equus]

Hereward said:

I was more surprised to see the holes drilled so close to the edge.

This.

It looks to have more than 'very light' scoring to me, too, though.

As others have said, it's impossible to say what the inside face is like, in terms of corrosion.

[bowder]

How much of a lip is there? ON the face of it it looks fine.

[braddo]

snotrag said:

If the question really is 'will it' then the answer is no - but only based on what we can see.

If the actual question is 'I've just been given an advisory and i dont agree with it....' then its more likely/completely possible that the inside face of the disc is completely mullered. Very common.

When you say inside face do you mean where the vanes are on a vented disc (so like the disc having 2 outer faces and 2 inner ones)?

[Lincsls1]

^^^ No they mean what do the discs look like from the other side of them, the inside face.

[OverSteery]

Do the other 3 surfaces all the look the same as the one in the photo?

[kambites]

For corrosion, no unless the other side is far worse.

For scoring, it's impossible to say from that picture.

[Pica-Pica]

braddo said:

snotrag said:

If the question really is 'will it' then the answer is no - but only based on what we can see.

If the actual question is 'I've just been given an advisory and i dont agree with it....' then its more likely/completely possible that the inside face of the disc is completely mullered. Very common.

When you say inside face do you mean where the vanes are on a vented disc (so like the disc having 2 outer faces and 2 inner ones)?

Inner means inboard, not ‘inside the disc’.

As for scoring, how does it feel with a finger nail?
Don’t get hung up on an ‘advisory’ OP.

[braddo]

Thanks.

If the pads clamp both sides of the disc why does the inner face get more corroded?

[ChocolateFrog]

braddo said:

Thanks.

If the pads clamp both sides of the disc why does the inner face get more corroded?

More salt spray, less cleaning.

Any issues with the pad/caliper often not spotted if it's on the inner face so it quietly just gets worse until it either gets really bad or is picked up on the MOT.

Have a look yourself if it's bugging you.

[julian64]

there is something very strange about that disc. The position of the outermost hole is not consistent with the other holes. It almost looks as if someone has drilled the outer holes of a different size and by hand. Its making my teeth itch.

I would say they look messed about with

[braddo]

julian64 said:

there is something very strange about that disc. The position of the outermost hole is not consistent with the other holes. It almost looks as if someone has drilled the outer holes of a different size and by hand. Its making my teeth itch.

I would say they look messed about with

I suspect the outermost circles are not full holes and are more like a wear indicator. I have similar on the discs on my 911 (which I notice while clearing bloody brake dust out of the holes at track days...).

[Driver101]

julian64 said:

there is something very strange about that disc. The position of the outermost hole is not consistent with the other holes. It almost looks as if someone has drilled the outer holes of a different size and by hand. Its making my teeth itch.

I would say they look messed about with

It's just a dimple/blind hole on the outside. They are there on genuine discs. They look closer to the edge due to the lip on the disc.

It's hard to tell from the photo, but I suspect the discs is quite worn.

[InitialDave]

snotrag said:

If the question really is 'will it' then the answer is no - but only based on what we can see.

If the actual question is 'I've just been given an advisory and i dont agree with it....' then its more likely/completely possible that the inside face of the disc is completely mullered. Very common.

Agree on both points.