I drove on a dusty gravel path 5 miles at 10mph, some dust must have got on a brake pad or one of the shims.

Afterwards, sometimes when in parking lot speed and brake with steering together it makes a slight squealing sound. But very hard to reproduce, no sound braking at speed.

I got home and gave the wheel and calipers a nice foam and rinse hopefully that it will clear up. Had anyone have this happen before?