How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines force water through the coffee grounds using pressure. This type of brewing makes more strength than drip coffee. These machines need 9 bars of pressure to extract flavor from the coffee grounds. There are three kinds of espresso https://wwwcoffeeeuk73686.bloggazza.com/29133261/10-key-factors-on-espresso-machine-you-didn-t-learn-in-school