Is Your Breville Espresso Taste Sour (How To Fix)

Perhaps you recently purchased a new Breville Barista Express and are experimenting with different espresso settings each time. But they’re all a little sour.

So, don’t worry about this; we’ll give you some tips on how you can make your espresso that taste more sweet and less sour.

Why Does Breville Espresso Taste Sour?

The reason why the espresso you have made with the Breville Express is sour is because the water runs too fast through the coffee, although water should go slowly.

This is something that can happen when you’re not using enough coffee grounds, using the wrong grind size, or not tamping the coffee enough.

The taste of coffee is also affected by the temperature of the water. You might be using old coffee beans, which could be another reason for Breville Espresso tastes sour. For good taste, you should use fresh coffee beans.

Low Pressure On Breville Espresso Machine

If your machine is on a low-pressure level while brewing the coffee, it simply means that the water is passing through the coffee very easily, which is why your machine doesn’t have to apply a lot of pressure to send the water through. As a result, the espresso becomes sour.

The following are the most common causes of low pressure in your Breville:

You are Not Using Enough Ground Coffee

If you are using less ground coffee, it may cause the water to run too fast through the portafilter, as a result of which a sour espresso is produced. But using too much ground coffee may cause the water to run too slowly through the portafilter, as a result of which the espresso becomes bitter.

Fortunately, Breville created a brilliant solution to this problem.

When you first purchase your machine, a “razor tool” is given to the machine. This tool helps you measure the amount of ground beans you need to put in the portafilter. This equates to around 18 grams of coffee.

Simply place the ground coffee in the portafilter. Then, with moderate pressure, tamp the coffee and, with the help of a razor tool, remove the extra coffee.

Wrong Grind Size On Espresso Machine

The most common reason your machine isn’t creating enough pressure is due to the coffee grind size.

Water is easy to get through if the coffee grind size is too coarse. That’s why your machine does not have to use a lot of pressure, and you will not be able to get a proper cup of espresso.

Still, you will get the espresso with a lot of cream on it, but it will not be that tasty, and it will probably be sour. This usually happens when you are using a grind size of 10 or above. For espresso, many people choose a grind size of 9.

But this really could be different for you. It depends on the taste you like and the beans you use. You can try more grind sizes to find the one you prefer.

You can understand this by considering it like sand or rocks. Suppose you have a bucket full of rocks and fill it with water. Water will flow freely through it.

But if you have a bucket full of sand, you fill it with water. The water will just settle on top of the sand. It would require a lot of pressure to get the water through.

Not Tamping The Coffee

Tamping the coffee grounds slows the passage of water through them, causing your machine to apply more pressure throughout the brewing process.

The tamper is located on the left side of your Breville Barista Express and is attached by a magnet.

Simply push down on the coffee in the portafilter with the tamper. Press the coffee properly to compress it and ensure it is densely packed.

The Temperature Is Too Low On The Breville Espresso Machine

The ratio of water and coffee has a direct impact on the flavour of espresso. as in your Barista Express water pressure. The temperature also has an impact on the taste.

Here’s a step-by-step guide to changing the temperature on your Breville Barista Express:

  1. Turn off the espresso machine.
  2. Hold down the program button and once press the power button.
  3. press the two-cup button to raise the temperature by 4 degrees. 
  4. Furthermore, push the one-cup button to raise the temperature by 2 degrees.
  5. To reset the temperature to the default setting, press the power button 

What Is The Best Temperature To Use For An Espresso Shot?

It depends on you, which taste you like, and what the best temperature is for the taste you prefer.  

The ratio of water and coffee directly impacts the flavor of espresso. as in your Barista Express water pressure. The temperature also has an impact on the taste.

As a general rule of thumb, the hotter the water, the more flavor it extracts from the coffee.

The majority would prefer an espresso that is a little hotter since it will be slightly stronger. However, the espresso may be too strong and bitter for your taste.

A large amount of it also depends on the type of coffee bean you use. If you’re using dark roast coffee beans, the temperature should be between 185 and 195 degrees Fahrenheit.

We should use 190 to 200 degrees Fahrenheit for medium-roast coffee beans. We should go up to 195 to 205 degrees for lighter espresso roasts.

Of course, these are merely estimates. You can only find out by experimenting with different temperatures on your Breville Barista Express.

You Are Using Old Coffee Beans.

The quality of the coffee beans you use determines the flavor of your coffee. Use fresh coffee beans for the greatest flavor; it also enhances the pressure of your Breville Barista Express and keeps the water flowing properly.

If you store coffee in a dark place, it cannot go bad, but if you are using coffee older than a month, you’ll find that your coffee tastes sour after a while. However, there are various variations depending on the roast used.

Coffee beans in light and medium roasts have less CO2 than those in darker roasts. The darker roast beans cannot hold CO2 for a long time, but the light and medium roasts can. As a result, they remain fresher for longer.

It is recommended to use the darker roast beans as soon as you can, within a month. And for the lighter ones, you can store them for a long time.

Always store your coffee in a cold and dark place.

Final Words

There can be many reasons why Breville Espresso tastes sour. Some of the reasons we have mentioned in our article and their solutions. So I hope this article helps you solve the taste problem with your Breville Barista Express.

Meet Vishu Yadav, the coffee connoisseur behind With a barista background and a love for coffee, he explores diverse coffee cultures and brewing techniques. Join him for the latest trends, specialty roast reviews, and brewing insights on

Leave a Comment