2 inch black lines on left side of outgoing and incoming faxes and copies as well

Clean the scanner glass. This is the smaller piece of glass that is located just to the left of the large original glass. Or if you have an older or smaller model Brother the strip of glass is going to be located under/inside of the port where your documents are fed into the machine. This operation panel usualy just pops open and you can find the strip of glass inside. Just clean it with a bit of glass cleaner that has been sprayed on a soft cloth. Make a copy with the machine to test if the line is gone. If the copy mode comes out ok then your outgoing faxes will be ok. You can also make a copy before you start the cleaning process as the copy with the line on it can aid you in determining what area the glass needs to be cleaned.
Good Luck and Thank You for using Fixya.

Well you said the Lines are present when you are copying and when you are sending from the fax unit. Copying and sending functions both uses the scanning unit. What you lift open the document feeder for original documents. In there you should see rollers and a glass. clean this glass with cotton swab and alcohol for left to right the entire glass. Close the unit and try copying or sending, documents should now be clean.

If they are on the faxes that you send you need to clean the reading glass; open the cover where you place your originals when faxing and look in there and there is a thin glass that runs left to right. Clean the glass with a lint free cloth and glass cleaner with out ammonia or some rubbing alcohol.

If the lines are on your incoming faxes it is most likely from your drum. Replace your drum and that will most likely correct the problem.

It is NOT the drum. It is your document scanner. 2 inches wide is big so most likely it is not the typical scrap of paper or whiteout that gets stuck to the scanner glass. Lift up the ops panel where the documents are fed in to be copied. Look for a strip of glass that runs from one side to the other. Make sure there is nothing on the glass. At 2 inched wide it is more likely that you have some of the LED's that light up going bad. Under the glass is a row of LED's that light up to scan the document. If a block of these are not lighting up then this then causes the black band to show up. If this is the case then you will need to have the scanner repaired or buy a new machine which might be cheaper. No question tho, it is in the scanner as this is the only area that will cause clean incoming faxes but bad copies and outgoing faxes.
Good Luck and Thank You for using Fixya.

If it is just from incoming faxes and not from anything you print/copy then it is the sender's fax machine that is dirty. If everything you do has that line, try cleaning the scanner glass and corona wire.

If your INCOMING faxes have the same black line as your copies then the problem lies in the toner cartridge. A line on OUTGOING faxes and copies would suggest something on the scanner glass. This is a small strip of glass under the cover where your originals are fed into. Another way of testing is to run a report from the operation panel. If a report generated from the machine is ok then it is the scanner glass. If the report has a line then it is in the toner cartridge.
Good Luck

Stop! Does not need any parts...

If you do not use the automatic document feeder (ADF), you will see that the faxes are clean on the receiver's end.
(In other words, use the flatbed)

OK, now the fix:
1. open the scanner like you are going to use the flatbed glass.
2. On the far left part of the glass top, there is a "speck" or smear of dirt that you should be able to see.
3. Use eyeglass cleaner / wipe or other glass cleaner technique and clean the glass on the far left of the flatbed. ok, clean the whole glass while you are at it.
4. Your scanner (you didn't mention the brand or model number) may have a narrow slice of glass on the left of the flatbed... clean that, too.
5. Test it ... it should be ok now.

Hope this helps!

lift the auto feeder and clean the scanner glass that your pages scan across -it is dirty. You can make a copy afterward and this will tell you if you have solved the problem.

I bet your incoming pages are clean right? The Laser is not used for outgoing faxes.
Lift up your document feeder and clean the scanner glass that the documents are scanned across

1- itis on the Scanning unit open and look for a thin strip of glass, clean
2-the scanning unit is bad

Assuming it's only on Outgoing Fxs and not incoming as well ( that would indicate the drum)