Wheel noise only in reverse!

I’ve got a '96 Civic whose passenger-side front wheel produces a screeching, metal on metal sound when I back up. But there’s no brake pedal shudder, pulling or brake fade. Any ideas?

Maybe the brake pad wear indicator clip is angled in just the wrong way as to catch oddly in reverse ?
Put the car on a hoist , remove the wheel, and start experimenting and investigating.