noise shoes

Hello everyone:
for a few days a whistle has sounded to me in a back wheel (hot only) and when I support (slightly) the foot on the brake pedal is removed. As if they did not return the shoes to their site. Are I reason? Has anyone happened to you? I am a little worried that I recently changed a rear wheel bearing and the mechanic told me that the shoes and the bombs were new. What would you do?

Greetings, thanks in advance

Hello friend, I would disassemble the wheel and review that the shoes return quickly and are not touching on the bell, I would also check the hand brake cable, tell us to discover, greetings.

Thanks for your help Jal:

a greeting has no longer sounded