Water leaks from around the portafilter during extraction on a Breville espresso machine.

Safety: Be cautious of hot water spraying from the group head.

Steps:

• Inspect the group head gasket for cracks, flattening, or missing chunks.
• Clean the gasket and group head recess with a nylon brush to remove coffee oils and grounds.
• Check the portafilter ears and basket rim for damage or warping.
• If the gasket is worn, remove it with a pick and install a new Breville-compatible gasket, ensuring correct orientation.

Resolution: After replacing the gasket, lock the portafilter firmly and test with a blank shot. Replace the portafilter or basket if they are deformed and still cause leaks.