'FRENO' IS SPANISH FOR BRAKE, BUT IT SEEMS TO BE USED IN PORTUGUESE, SEE THIS EXTRACT FROM GOOGLE (FRENO + AVIAÇÃO)

Aerolineas Argentinas e da Aviação Naval Argentina,
o Jorge ... Fita isolante · Arame de freno ( fino), para desentupir

I SUGGEST YOU SCROLL THROUGH TO DOUBLE-CHECK.

http://www.google.com/search?q=FRENO AVIA��O&hl=en&lr=&safe=a...

'PILAS' AND 'BATERIAS' ARE TWO WORDS THAT EXIST IN PORTUGUESE & SPANISH, BUT WHICH ARE USED IN DIFFERENT WAYS, SO MAYBE 'FRENO' HAS A SIMILAR MEANING BUT A DIFFERENT USE IN PORTUGUESE.