are the shoes worn? this may be just a need to "burnish" and "arc in" the shoes due to rust in the drum. A lot of major brands of fork truck in this size range uses the same brake shoes and wheel brake setup, and all have a "cold brake squeal" some of the time, in part due to the hardness of the shoe's lining materials.
MCFA had some instructions about dragging the brakes until they smoked to get the shoes properly "burnished" and I have seen on forkliftaction some suggestions about adding baby powder to the inside of the brake drum through the adjuster window (this was on a like sized Toyota, but they all use the same Akibono (not willing to look up proper spelling) brake setup

I also do this to recover the straps of the jaws when they are soaked with oil

Hello. I usually take it up and gets better braking, I suspend a wheel with the lifting of the mast. and with the machine to work a little tightening up the brakes to heat until it begins to smoke, then do the other wheel the same. attention while it is hot but after just latch is ok. sorry to have responded in Portuguese

ola. eu costumo tirar isso e até fica com melhor travagem; suspendo uma roda com o levantamento do mastro. e com a máquina a trabalhar aperto um pouco o travão de pé a aquecer até começar a deitar fumo, faço depois a outra roda o mesmo. atenção enquanto estiver quente trava pouco mas depois fica ok