Top thread breaking every two inches

increase the needle thread tension up more

When I've experienced this problem, I've found frequently it's because the top thread is wrapped around something (the spool pin, a thread guide, etc.) so there is something that will not allow the thread to feed smoothly. The thread stitches and stretches until it can no longer stretch and then breaks. I would remove the top thread completely from the machine and rethread from the beginning. Be sure to ALWAYS RAISE the presser foot when threading the top thread. Check if the machine is threaded correctly. Also check that the tension is not too tight.

...

I'd try switching the needle type & size and then a different brand of thread.

5 things you need to know about thread when free motion quilting

Machine Quilting Thread Shreds Then Breaks

Thread Top Thread Breaking Shredding while free motion quilting NEED HELP

Thread breaking or fraying when free motion stippling

Oh, yeh, one more thing I just thought of: Rethread the top thread and make sure the thread is not hanging up on the spool, spool pin, or wrapped around a thread guide. When my thread breaks after 3-4 inches, it's usually because something is stopping the top thread.

Remove all the threads.
Replace the needle.
ALWAYS RAISE the presser foot and rethread from the beginning.
Verify each thread is in the correct thread path.
ALWAYS THREAD each in the order specified or you will continue to have problems--for a lot of machines, the order is Upper Looper, Lower Looper, then needles.
Check the tension on that particular thread--too tight, it will break.

Breaking thread after about an inch usually indicates it is mis-threaded--a guide has been skipped or threaded out of order or the thread may be wrapped around something.


Serger needle thread breaking sewing discussion topic PatternReview com

http://www.amitymama.com/threads/anyone-have-an-idea-why-my-serger-needle-thread-keeps-breaking.280524

Sew What Up View thread Help Needle thread keeps breaking

Be sure to ALWAYS RAISE the presser foot when threading the top thread--this releases the tension disk so the thread will seat properly.

Sewing Machine Problem 1 Thread Breakage

Sewing Machine Thread Keeps Breaking

http://www.servicethread.com/blog/stop-industrial-sewing-thread-breaks

Why Does My Thread Keep Breaking While Sew

Singer Sewing Machine Breaks Thread

..

If your machine is mechanical (not computerized), it could very well benefit from a good cleaning and oiling, including the internal mechanical movement. Squeaking could be the feed dogs but could be a multitude of places.

When threading the machine, be sure to ALWAYS raise the presser foot. The fact that the top thread is breaking about 6 inches into the sewing indicates that the thread is catching somewhere. Sometimes, it catches on the thread notch on the thread spool. Other possibilities is that the thread is looped around something, ie the spool pin, a thread guide... Remove the thread entirely from the machine and rethread from the beginning.

Elna Elnita 244 245 Sewing Machine Threading Diagram

This may help you if you decide to try to oil your mechanical machine:

Wheel on right side that controls the needle up and down is very tight...

...

make sure to keep long thread tail for the top & bobbin
of 4 to 6 inches & pulled behind the needle

Hello. The tension needs to be adjusted. When the top thread breaks, often the top thread breaks when the top tension is too tight. Go to this link to learn more. http://www.ca.uky.edu/HES/fcs/FACTSHTS/CT-MMB-213.pdf

It sound like it is not threaded properly or the tension is too tight, You should be able to pull on the thread manually without breaking it
look for your manual here
http://www.brother-usa.com/manuals/default.aspx?ProductGroupID=3

One of the most common mistakes with overlockers is that the threads must always be threaded in order. So if you sew about 1 inch and the thread breaks try unthreading the eyes of the needles rethread the looper and then rethread the eyes of thew needles. If not you will get the same result of sewing about 1 inch and it will break again.