Torque Shop: Hissing noise when using the brakes is not normal and should be rectified immediately

A hissing sound when braking indicates a vacuum leak in your car's brake system, requiring immediate inspection and repair to ...
CarsGuide

My 2007 Toyota RAV4’s brakes are playing up

My 2007 Toyota RAV4’s brakes are playing up, they are making an air-leak sound when I press the pedal. At times I get a hard pedal. The car gradually stops and there is plenty of brake fluid? The ...