How to Properly Maintain and Clean an Espresso Coffee Machine Espresso machines push water through the coffee grounds using pressure. This type of brewing creates an even stronger drink than drip coffee. The machines require 9 bars of pressure to extract flavor from the coffee grounds. Espresso machines are available https://www-coffeee-uk33079.dreamyblogs.com/30129285/five-coffee-machines-espresso-lessons-from-the-professionals