Front brake problem

[Peyton]

Front brakes will grab quickly and then break loose making a rasping/ scraping sound on occassion when hard braking.

Pulled drums and noted that backing plates are not loose and brake linings look good. I did file the lining edges just a bit to see if the shoes/ linings might seat better in the drums when when braking. This did not appear to help much.

The linings are still thick and look relatively clean. Estimate that I've got somewhere between 35 and 40 thousand miles on them.
Would sure appreciate your thoughts on this.

Peyton