The bobbin goes in the bobbin case, which sits under the needle plate

Your Brother sewing machine has two thread sources: the spool on top (the one you thread through the needle) and the bobbin underneath, which holds the lower thread. The bobbin is a small plastic or metal spool that winds with thread and drops into a case under your needle plate. Loading it correctly takes about two minutes once you know where everything sits.

The bobbin case is a removable metal or plastic housing that holds the bobbin steady and controls thread tension from below. If your machine is not making stitches, or if stitches look loose and loopy on the underside of your fabric, the bobbin is often the culprit — either it is not wound properly, not inserted correctly, or the case itself needs cleaning.

Key Takeaways

  • Wind the bobbin on your machine's winding spindle before you load it into the bobbin case, using the same thread as your top spool.
  • The bobbin case sits directly under the needle plate; you lift the plate up to access it, and the case itself may slide out or stay fixed depending on your Brother model.
  • Thread the bobbin through the tension spring inside the case so the thread sits in the slot, then insert the bobbin so the thread unwinds counterclockwise.
  • Close the bobbin case cover and lower the presser foot before sewing, because the presser foot engages the tension discs that control bobbin thread.

Wind the bobbin before you load it

A bobbin must be wound before it goes into the case. On your Brother machine, the winding spindle is on top of the machine, usually to the right of the main spool holder. Place an empty bobbin on this spindle, then guide your thread from the top spool down to the bobbin winding guide (a small metal or plastic loop on the machine body). The exact path varies by model, so check your manual for the thread path diagram specific to your machine.

Once the thread is threaded through the guide and wrapped around the bobbin a few times by hand, press the foot pedal or the start button. The bobbin will wind automatically. Most Brother machines have a sensor that stops the bobbin when it is full — you will hear a click or feel the machine stop. Cut the thread and remove the full bobbin. Do not overfill it; a bobbin that is too full can jam in the case.

Locate and open the bobbin case

Raise the presser foot (the metal arm that holds fabric down) and raise the needle to its highest point by turning the hand wheel toward you. Lift the needle plate — the flat metal plate directly under the needle — by pressing the release button or lever on the side of the plate. On most Brother machines, this button is near the presser foot bar.

Under the needle plate, you will see the bobbin case. On some Brother models, the case is removable and slides out to the side; on others, it stays fixed in place. Check your manual to see which type you have. If it is removable, slide it out gently. If it is fixed, you will thread the bobbin while it is in place.

Thread the bobbin through the tension spring

Look inside the bobbin case. You will see a small metal spring with a slot or notch. This is the tension spring, and it controls how tightly the bobbin thread feeds. Pull the thread from your wound bobbin and guide it into the slot in the tension spring. The thread should sit snugly in that slot — you may need to tug gently to seat it properly.

Once the thread is in the tension spring slot, let about 4 to 6 inches of thread hang loose below the case. This tail will be caught by the needle thread when you start sewing, and the two threads will lock together to form a stitch. If the thread is not seated in the tension spring, stitches will be loose and uneven.

Insert the bobbin into the case

Hold the bobbin so the thread unwinds counterclockwise (when you look at the bobbin from the side, the thread should come off the left side as it spins). Drop the bobbin into the case, making sure it sits flat and the thread stays in the tension spring slot. The bobbin should not wobble or tilt.

If your bobbin case is removable, slide it back into the machine under the needle plate until you hear or feel it click into place. If it is fixed, straightforward make sure the bobbin is seated and the thread is still in the tension spring. Close the needle plate by lowering it back down until it clicks.

Lower the presser foot and test

Before you sew, lower the presser foot. This step is straightforward to skip but critical — the presser foot lever engages the tension discs that control how tightly the bobbin thread feeds. Without the presser foot down, the bobbin thread will be too loose and your stitches will fall apart.

Turn the hand wheel toward you to lower the needle into the fabric, then raise it again. This action will catch the bobbin thread and pull it up through the needle plate. You should see a loop of bobbin thread come up. Pull gently on the top thread to bring the bobbin thread loop all the way up, then pull both threads to the back and to the side, away from the presser foot.

Clean the bobbin case if stitches still look wrong

If you have loaded the bobbin correctly but stitches are still loose, loopy, or uneven, lint and thread bits may be blocking the tension spring. Raise the presser foot, raise the needle, and remove the bobbin case (or open it if it is fixed). Use a small brush — many Brother machines come with a lint brush — to gently sweep away any lint or thread fragments from inside the case and around the tension spring.

Pay special attention to the slot in the tension spring itself. A single thread fiber caught there can throw off tension. Once the case is clean, reload the bobbin and test again. If stitches are still wrong after cleaning, the tension spring may be bent or damaged, and you may need to replace the bobbin case itself.

Frequently Asked Questions

What does it mean if the bobbin thread keeps breaking?

A breaking bobbin thread usually means the bobbin is wound too tightly, the thread is not seated in the tension spring slot, or the bobbin case has lint blocking the tension spring. Check that the thread is fully in the slot, clean out any lint with a brush, and try rewinding the bobbin more loosely. If the problem persists, the tension spring may be bent.

Can I use a metal bobbin instead of plastic?

Check your Brother manual. Some Brother models use metal bobbins, others use plastic, and using the wrong type can cause tension problems or jamming. Brother bobbins are inexpensive and widely available, so it is worth buying the correct type for your specific machine model.

Why is my bobbin not winding?

Make sure the bobbin winding spindle is engaged. On most Brother machines, you push the spindle to the right or flip a lever to set up winding mode, which disengages the main needle. If the spindle is engaged and the bobbin still will not wind, check that the thread is threaded through the bobbin winding guide and wrapped around the bobbin a few times by hand before you start.

How tight should the bobbin thread be in the tension spring?

The thread should sit snugly in the slot but not be forced. You should be able to pull the thread gently and feel slight resistance from the spring. If the thread slides through with no resistance, it is not seated properly. If you cannot pull it at all, it may be pinched or twisted.

Do I need to rewind the bobbin every time I change thread color?

Yes. If you want a different color in the bobbin, you need to wind a new bobbin with that thread. You cannot straightforward pull out the old bobbin and insert a new one without winding it first, because bobbins must be wound on your machine to work properly with your specific tension settings.