What would cause this scoring

[Scaf]

My Jaguar XJ is in for a service, just 17k miles and the inspection video has flagged this on the inside of one of the front discs.
They recommend nee pads and discs (dream on) but it’s very neat and precise, I have had the car since 1500 miles and have not had any squeals or anything from the brakes.
Could it be a fault pad?

 

[safrane]

Stone in the pad?

 

[spkennyuk]

The lip on the edge of the disc if it is pronounced as much as it looks in the picture is heading into MOT fail territory.

 

[Oneball]

Stone would be my guess too. Bad luck. Don’t dick around, get new discs and pads. With what the wear looks like on those discs and the groove they’ll be mighty close to the venting and the disc breaking up.

 

[Scaf]

I didn’t notice the lip as I concentrated on the neat groove.
The advisory is to swap discs a my next pad change rather than now but I will take the car to my local brake chap for an inspection.

mileage is 12k not 17k, pads are 20% worn, can’t see how I could have gone through a set of discs on just 20% of pad and on such low miles.
On previous XJ ‘s I would easily get 35k miles on discs - all very odd.

 

[Zep]

I didn’t notice the lip as I concentrated on the neat groove.
The advisory is to swap discs a my next pad change rather than now but I will take the car to my local brake chap for an inspection.

mileage is 12k not 17k, pads are 20% worn, can’t see how I could have gone through a set of discs on just 20% of pad and on such low miles.
On previous XJ ‘s I would easily get 35k miles on discs - all very odd.

As others have said, almost certainly a stone and bad luck. If the wear is high I am sure your brake chap will make sure the pistons are free and that there isn’t an imbalance.

 

[Scaf]

make sure the pistons are free and that there isn’t an imbalance.

not with standing the scoring, I do worry about stuck pistons etc
Will take it in on Friday to get checked out by someone I know, rather than a random tech

 

[Gazcw]

not with standing the scoring, I do worry about stuck pistons etc
Will take it in on Friday to get checked out by someone I know, rather than a random tech

Had the same on my rangie on brand new discs. No squeal or any noise. Had a sticking rear piston on it too and it gave a weird sensation/vibration when it stuck. Got so hot the disc changed colour and the wheel paint cracked.

 

[MarkMas]

Crows?

 

[Wattie]

Crows?

Hope they’re not invited to the Goodwood “Beeakfast Meet.......” advertised elsewhere.

 

[hunta]

Crows?

Beat me to it

 

[GeoffCapes]

A friend of mine had this from a BMW dealer in Essex, they sent him a similar pic, but being a tight ar5e he said that he would change the discs himself rather than pay them to do it.
He was glad he did, as they had sent him a pic of someone else's car, trying to drum up trade.
He kicked up a huge fuss threatened the papers etc (and rightly so) got free servicing for his car for the next 2 years (parts and labour) and a weekend away for him and his missus. Stoke Park if memory serves me correctly.

 

[Gazcw]

Hope they’re not invited to the Goodwood “Beeakfast Meet.......” advertised elsewhere.

Not sure if that is funny or a groanfest. I am perched on the telegraph wire.

 

[MarkMas]

Id

Not sure if that is funny or a groanfest. I am perched on the telegraph wire.

If only someone could find the caws.

 

[Scaf]

A friend of mine had this from a BMW dealer in Essex, they sent him a similar pic, but being a tight ar5e he said that he would change the discs himself rather than pay them to do it.
He was glad he did, as they had sent him a pic of someone else's car, trying to drum up trade.
He kicked up a huge fuss threatened the papers etc (and rightly so) got free servicing for his car for the next 2 years (parts and labour) and a weekend away for him and his missus. Stoke Park if memory serves me correctly.

Interesting, the pic is a “screen shot” from a video which would have meant some editing, so unlikely.
But the whole thing seems strange - no way could I have worn a disc or with only 20% pad wear.
Anyway, hopefully learn more tomorrow after independent inspection

 

[Scaf]

Well took the car to my “go to” tyre / exhaust / brake place, all good and pistons all working perfectly.
The picture makes the “lip” much much worse than it is and it’s well within tolerance, he waits they will take a look again when the pads need doing in a bit 15k miles.
Much cheaper weekend than it could have been