Mysterious Wear to Brake Discs

[Pug_XUD_KeenAmateur]

Any ideas how this has happened?

Needless to say Discs & Pads have been replaced, 49k old (Jun 2015) Pagid & Bosch respectively.

That pad is the 'correct' pad from that side of that caliper.

That Brake was found to be dragging a bit: a clean up of the Piston has resolved that; can't see that being relevant though.

When New

[RichardW]

Looks like the pads are a little undersized and have left a rim at the edge unswept which has then grown and worn into the pads. Just one of those things.... doing well to have got 50k out of a set of pads!

[Skull]

It's always puzzled me why pads don't extend to the full diameter of the disc and it seems acceptable to have that lip build up - is it just to show visually how much the disc has worn

Your old pads seem to be a poor fit but I would still be using them

[white exec]

Not unusual wear on discs that have done a lot of work.
Normal disc wear takes place on the swept area, and the outer edge of the disc (a) remains unworn, and (b) rusts and swells. The lip just wears a groove into the pad outer edge, especially if replacement pads are slightly wider than those previously used.

[moizeau]

Agree with everything mentioned above, it's normal. If you then measure thickness of the swept area and it is within the limits take an angle grinder to the lip.

[Pug_XUD_KeenAmateur]

thanks Guys, not ideal that I've gone to the bother to change the Pads & Discs; but glad the puzzle's solved

I was under there to confirm to myself whether the 'Knock' is the Bottom Engine Mount (it is, and it'll keep) and noticed this. Long trip to hilly Devon 3 up next week, so got it sorted toute suite; fronts 'll have a bit of a 'holiday' coz I'll have peeps in the back, but all the same. ...and you never know when someone's gonna do something stupid; methinks running an older high mileage car its obligatory to be extra careful with safety matters.

I think one of the advantages of Diesels Richard is that you don't actually need the brakes much, in most situations, hence the healthy mileage on the pads. I noticed driving Daughter's petrol 1.1 C3 the evening mine was out of action how much more you use 'em. Mostly I just ease off the throttle and the engine compression takes care of it (not one for coming down the gears, my Driving Instructor always said 'Brakes are Cheaper than Clutches'; 1987, makes me feel old!).

NB: quite impressed with the new TRW Brand Brake Pads, which included a new set of Caliper mounting bolts (the little 13's), each Loctite'd. My Factors told me they're top quality and I was a bit doubtful, but they were all I could readily get; seems that's worked out well.