Brake Magnet Condition

[1937HD45]

How can I tell if this magnet is worn out? I can't find any pictures of this style of wear indicator to determine if it's OK or not.

[1937HD45]

Here it is. Good until the ribs are gone?

[1937HD45]

Old-Biscuit,

Where is this preference setting? On this forum or at Google photos?
I know it should wear even and flat, the question is how much before replacement.

[Old-Biscuit]

Link doesn't work

Brake magnets should wear evenly...be flat



They should not be scored/gouged



They should not be so worn the wiring is showing