Brakes hissing when pedal applied

Good overview !, for my sister ! I would like to see a breakdown on How to R&R. The retaining clip has a dual purpose, it is also retaining a Plastic gizmo riding on top of the brake pedal plunger rod? We destroyed ours in the removal, I wanted to pull the coulmn, just to get at the the clip, any one out there with any expolded views, let me know.
God Bless & thanks,
goldslegerdad@yahoo.com

Your power brake booster is leaking vacuum, you will in the end loose the power brakes, it is called the power booster, they are available from any good parts store, like NAPA, very pricey at dealer. Some units are available separately, others they want you to buy the booster and master cylinder as a unit. It takes a couple of hours to replace, and the brakes will have to be bleed if you end up replacing the master cylinder, 2 people make the job much easier.