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    Unlike your running sneakers, your  car's brake shoes   aren't meant to help improve your mile time. They're actually designed to help you stop your car! In fact, brake shoes are an essential element of certain braking systems, and, contrary to popular belief, they are not the same thing as brake pads. Learn what brake shoes are, why they're important, and how they stand apart from brake pads.   WHAT ARE BRAKE SHOES While brake pads and brake shoes perform similar functions, they are not the same thing.   Brake pads are part of a disc brake system. In such systems, brake pads are squeezed together by a caliper against a rotor disc  —  hence the name "disc brake." The pads squeezing against the rotor generate the friction needed to stop the car.   Brake shoes are part of a drum brake system. Brake shoes are crescent-shaped components with a rough friction material on one side. They sit inside of a brake drum. When the brake pedal is pressed, the brake shoes

A   rubber stopper  is a small, tapered plug used to seal the openings of test tubes, flasks and other laboratory glassware. Stoppers made of cork are also available for this purpose. However, rubber stoppers are preferable for applications that require a tighter seal or a greater degree of chemical resistance.   What are stoppers used? A stopper or cork is a cylindrical or conical closure used to seal a container, such as a bottle, tube or barrel. Unlike a lid or bottle cap, which encloses a container from the outside without displacing the inner volume, a bung is partially or wholly inserted inside the container to act as a seal.   What is the purpose of a rubber stopper? What are rubber stoppers?  Rubber stoppers ​ are ideal for plugging joints or holes in laboratory glassware and creating a liquid-tight seal. Rubber bungs are often used with glass containers such as test tubes, flasks, jugs, and many other pieces of standard lab equipment.   What is a vial stopper? Rubber stoppers