Breville Barista Express — Grinder & Espresso Flow Improvement Technique

The Breville Barista Express (BES870 series) is known for its built-in conical burr grinder and semi-automatic espresso controls. Over time, coffee oils, fine retention, and water scale can cause poor flow, inconsistent pressure, or weak shots. This guide walks you through essential maintenance steps that restore smooth grinding and proper extraction without opening the machine. For reference diagrams and operating specifications, you can consult the Breville Barista Express instruction manual on ManualsLibraryy.

Tools & Materials Needed

• Grinder brush or soft paintbrush
• Paperclip/toothpick (for chute clearing)
• Fresh water
• Espresso machine cleaning tablets
• Backflush disc (rubber cleaning disk)
• Microfiber cloth

Difficulty

• Easy

Time Required

• 15–20 minutes

Step 1 — Empty and Clean the Hopper

• Turn the machine off and unplug it.
• Remove the bean hopper and empty any remaining beans.
• Wipe the inside of the hopper with a dry cloth to remove oils.
• Set the grind size to a coarse setting to reduce static while cleaning.

Step 2 — Brush the Burrs

• Remove the upper burr by unlocking and lifting it out.
• Use a soft brush to clean the burr teeth and remove fine coffee buildup.
• Brush the lower burr while keeping fingers away from the cutting surface.
• Do not use water—burrs must stay dry.
• This clears compacted grounds that restrict grinding speed and consistency.

Step 3 — Clear the Grinder Chute

• Insert a toothpick or paperclip into the grind chute from below.
• Gently break up any lodged coffee clumps.
• Tap the side of the grinder to loosen stuck grounds.
• A blocked chute is a common cause of slow grinding or “no grind” situations.

Step 4 — Backflush the Group Head

• Place the rubber backflush disc into the portafilter.
• Add a cleaning tablet.
• Lock the portafilter into the group head.
• Start the cleaning cycle or switch the machine on/off in 5–7 second pulses for one minute.
• Rinse by running several cycles with clean water.
• Backflushing removes oils and residue that restrict water flow during extraction.

Conclusion

Regular grinder cleaning and proper backflushing dramatically improve extraction quality on the Barista Express. These steps address most issues with pressure, flow, grind consistency, and taste.

For detailed diagrams, settings, and maintenance tips, refer to the Breville Barista Express instruction manual on ManualsLibraryy.