How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines force water through the coffee grounds by using pressure. This method of brewing produces an even stronger drink than drip coffee. These machines require nine bars of pressure in order to extract the flavor from the ground. Espresso https://www-coffeee-uk03230.bcbloggers.com/29294467/from-the-web-the-20-most-amazing-infographics-about-espresso-machine