Rear Brake Pad Dimple Thingy

[Martin350]

Does anyone here know what the small round 'dimple' thing on the back of some rear brake pads is actually for?
It locates into the caliper piston, of course, but why?

In this photo, the top pads are after market without the 'dimple' and the pads at the bottom are o.e. with the 'dimple'.



I'm guessing it can't be too important that it isn't there but I'm curious now as to what the dimple does.

Edited by Martin350 on Thursday 2nd March 15:53

[Martin350]

Yes, but why?

[Martin350]

Dave Brand said:

No, what it means is that the aftermarket manufacturer has missed a feature which the OE manufacturer considered necessary.

By the way, the correct term is spigot!

Ah, I did wonder what the correct term for it was, thanks!

[Martin350]

And thanks to all who have replied.

They aren't my pads but a friend of mine's and he asked me what I thought.
I had my suspicions and they seem to be confirmed.

Thanks!