the brake booster it is making a hissing noise

Here is a guide that will help with this. Plus a video on a different Saturn that will help with this as well.

https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd

https://www.youtube.com/watch?v=-uuJsxJ6V8k

Below is the process from the manual that will help with this as well. Please let us know if you have other questions. Thanks