strange noise when braking

[chevyislife]

ive had my Colorado for a few months and i have 0 complaints about it, well maybe 1. when i brake i can hear a strange noise like a dog whistle that only dogs can hear well i can hear this one and it seems to be coming from somewhere behind the dash. Anyone have any idea about this?

 

[LexLuthorQJ097]

ive had my Colorado for a few months and i have 0 complaints about it, well maybe 1. when i brake i can hear a strange noise like a dog whistle that only dogs can hear well i can hear this one and it seems to be coming from somewhere behind the dash. Anyone have any idea about this?

that dog whistle noise when you brake on your Colorado might be a brake booster leak you may check behind the dash or lube the pedal rod!