Rubbing/grinding between cleat and pedal

Hey guise.

So I've noticed a disconcerting rubbing/grinding noise and sensation when pedalling hard on my bike, on the left side. I initially worried it could be frame flex caused by a crack rubbing against the tire (not a nice thought while barrelling down the okr overpass), but a close inspection revealed nothing.

I noticed as I was ambling back on back roads that it happens primarily when I apply downward force onto the pedal while clipped in, especially as my foot rotates with the float. My initial thought then was that it was a pebble caught in the cleat or pedal but no such item was to be found.

When I got home I looked at the pedal and it's covered with flakes of brass filings from the cleat, as if it is mashing against the top of the pedal.

Is this just cleat wear? I did notice it happen after I walked longer than I would have liked across a gravelly surface.

I'm using time atac xs pedals and 5-6 month old cleats.

Any other thoughts?

Thanks

Sounds like your cleats are worn, particularly if you are find brass filings coming of your cleats. Take off the cleats and give them a good clean, as well as the underside of your shoe, re-fit and test ride. If it still happens then consider replacing the cleat/s IMO.

Are you sure it's coming form the cleat and not the pedal or even the crank?

if it is not a problem with the cleat I have noticed the rubber seal between the atac pedal body and the spindle often squeaks, lubricate with something that will not eat into the rubber