There is a slight hissing sound when I put my foot on brake pedal

What is your question?

The brakes are hissing on my 2012 Mazda CX-9 and when I press the brake pedal all the way down it squeaks sometimes. It only has 71,000 miles. Ive been told brake pads are ok.

What makes this problem better or worse?

When brakes are not in use

How long has your 2012 Mazda CX-9 had this problem?

1 week