When you apply the brakes, brake fluid is forced under pressure into the wheel cylinder, which in turn pushes the brake shoes into contact with the machined surface on the inside of the drum. When the pressure is released, return springs pull the shoes back to their rest position.
Normally, protein is not removed when the kidneys filter waste from the blood. However, when the kidneys are damaged, protein leaks through the damaged filters and is removed from the body in the urine, along with the waste products.
Protein in your urine is a sign of kidney damage. The protein you eat has amino acids, which your body needs to build tissues, including bones, muscles, nails and hair. Protein also helps protect your body from infections, produces hormones and helps regulate the amount of fluid in your body. One function of your kidneys is to remove waste products from your blood and leave protein behind for your body to use.