Brother DCP-130C refuses to print the magenta ink

You have a blockage in the print head and/or feed line from the ink cartridge to the print head. One possible fix would be to make a pad of paper kitchen towel wet it and sit the print head on it overnight. With luck the pad will soak the blockage and draw ink through the head. Give the machine two self cleans and try a print quality test to see if you have made ANY improvement. If no improvement - forget it as the blockage has been there too long.

clean the heads. and re-calibrate the printer nozzles

For some reason it's not printing with the magenta ink. If you were out of that color it would tell you, so either all the magenta nozzles are clogged, or the printhead has gone bad.
At the top of the control panel is a button labeled Ink Management (or just Ink). Press that and choose Cleaning. Some machines will allow you to clean only certain colors - you want Magenta. When it's done, print a test page - also in the Ink Management menu. If it's improved, do it again until all the dots print for each color. Inkjet machines clean their nozzles by blasting them out with ink. If you're low on ink you should have spare cartridges ready to swap.
If no magenta prints at all, but the other colors are fine, your printhead has failed. If the machine is less than a year old it's a warranty repair, see Brother's website for the closest service center. If it's just past warranty, call Brother's customer service line and beg for a Work Order to be sent to a service center to cover your machine. Note that they will insist that your ink cartridges be genuine Brother brand before doing free repairs for ink problems.
If it's out of warranty, a repair would probably cost more than a new DCP 130C. Good luck.

I can't just print black with my Brother DCP-130C printer when one colour runs out of ink the printer wont work. Can anyone help me thanks Stan

Is it clean? Most ink jet printers have a simple user procedure for cleaning the print heads. You may have to clean them periodically or after the printer has been idle for a few days or weeks. If you see funny colors or print-outs are missing colors, a cartridge may be empty or a head dirty. You may have to clean a head many times to get it working again.

have you recently had a paper jam. somtimes pieces of paper can become trapped under the print head which restricts the printing. if there is and its been there for a while the print head may need to be wiped/cleaned( a bit tricky) then a couple more print head cleans.

Brother DCP-130C is not printing and is refering me to the manual which is useless. It also says "Unit unable 43" .
Any help great! Cheers

is this still current?

nope..this is a clogged line issue, and unless you have the time, technical skills, and patience, this is best done by someone that gets a charge from taking apart printers...

after replacing the ink cartridges it took several cleans to come good. I have no idea how to "manually" clean the heads. So I told the printer to do it many (about 7) times. It eventually worked