The drum unit is a separate part from the toner cartridge, and you replace it when pages start showing black streaks or white lines

Your Brother printer has two consumable parts: the toner cartridge (which holds the powder) and the drum unit (which transfers that powder onto paper). The drum wears out over time — typically after 15,000 to 30,000 pages, depending on your model — and shows itself through visible defects on every page. Black streaks, white lines, or smudging that won't go away with a cartridge swap means the drum needs replacing, not the toner.

The process takes about five minutes and requires no tools. You'll need a replacement drum unit for your specific printer model (not a generic one — Brother drums are model-specific) and a clean, flat workspace. The old drum goes into recycling; many retailers that sell Brother supplies will take it back.

Key Takeaways

  • Brother printer drums are model-specific, so you must match your printer's exact model number before ordering a replacement.
  • The drum unit is separate from the toner cartridge and typically lasts 15,000 to 30,000 pages before showing streaks or lines on printed pages.
  • Replacement involves opening the front panel, removing the old drum assembly, and sliding the new one in — no tools or special knowledge required.
  • Toner powder will come out during replacement, so work over a trash can or newspaper and avoid touching the shiny roller inside the drum.

Find your printer model and order the correct drum

Brother uses different drum part numbers for different printer lines. Look at the back or bottom of your printer for a label showing the model number — it usually starts with "HL-" or "MFC-" followed by numbers. Write this down exactly.

Search for "[your model number] drum unit" on the Brother website or a retailer like Amazon, Staples, or B&H Photo. You'll see the correct part number listed. Brother drums typically cost between $40 and $80 depending on the model. Do not buy a "compatible" or "remanufactured" drum unless you're certain it's made by Brother — off-brand drums can damage the printer or produce poor-quality pages.

Open the printer and locate the drum assembly

Turn off the printer and unplug it. Open the front access panel — on most Brother models, this is a hinged door on the right side of the machine. You'll see the toner cartridge sitting in a metal frame, and directly behind or below it is the drum unit. The drum is a large cylindrical part, usually gray or black, with a green or yellow lever on one side.

Some models have the drum and cartridge as one unit; others have them separate. Check your printer's manual (available as a PDF on the Brother support website) if you're unsure which part is which. The manual will show you exactly what you're looking at.

Remove the old drum unit

Before you touch anything, place newspaper or a trash can underneath the printer opening — toner powder will spill out. Locate the green or yellow lever on the drum unit and pull it toward you firmly. The entire drum assembly should slide out as one piece. If it doesn't move, check that you're pulling the correct lever and that nothing is blocking it.

Set the old drum on the newspaper. Do not touch the shiny black roller inside the drum — oils from your skin can damage it and ruin the new drum when you install it. If you've already touched it, wipe it gently with a lint-free cloth.

Install the new drum unit

Remove the new drum from its box and check that it matches your printer model number. Some new drums come with a protective plastic cover over the roller — remove this before installation. Align the drum unit with the metal frame inside the printer and slide it in firmly until you hear or feel it click into place. The lever should be in the same position as it was on the old drum.

Close the front access panel. The printer should power on automatically or prompt you to press a button. Some Brother models will display a message asking you to confirm that you've installed a new drum — press OK or Yes to clear it.

Test the printer and dispose of the old drum

Print a test page to confirm the streaks or lines are gone. If the page looks clean, the replacement worked. If you still see defects, the issue may be with the toner cartridge instead — try replacing that next, or contact Brother support with a photo of the problem page.

The old drum unit contains toner residue and should not go in regular trash. Many office supply stores (Staples, Office Depot, Best Buy) accept used printer cartridges and drums for recycling at no charge. Some Brother retailers will also take them back. Call ahead to confirm they accept your model.

When to replace the drum versus the cartridge

Black streaks, white lines, or repeating marks on every page point to the drum. Faint or light printing points to the toner cartridge. If you replace the drum and pages still look wrong, the cartridge is likely next. Brother printers will also display a "drum low" or "replace drum" message on the control panel when the drum is nearing the end of its life — this gives you time to order a replacement before pages start showing defects.

Some Brother models have a reset button on the drum unit itself. If your printer shows a "drum low" message but pages still look fine, you can press this button to extend the drum's life by a few thousand more pages. This is a temporary measure, not a permanent fix.

Frequently Asked Questions

Can I use a non-Brother drum in my Brother printer?

Non-Brother drums may fit physically, but they often produce poor-quality pages or cause paper jams. Brother drums are engineered specifically for each model's electrical and mechanical specs. Stick with genuine Brother parts to avoid damage or warranty issues.

What if I can't get the old drum out?

Make sure you're pulling the correct lever — some models have multiple levers and only one releases the drum. Check your printer's manual for the exact location. If it still won't budge, stop pulling and contact Brother support rather than forcing it, which can break internal parts.

Do I need to replace the toner cartridge at the same time?

No. The drum and cartridge are separate and wear out independently. Replace only the part that's failing. However, if your cartridge is also low on toner, replacing both at once saves you a second maintenance session.

How do I know if my printer has a replaceable drum or if it's built in?

Most Brother laser printers have a removable drum. Inkjet Brother printers do not — they use cartridges only. Check your printer's manual or search "[model number] drum replacement" to confirm. If no results come up, your model likely doesn't have a replaceable drum.

Can I reset the drum counter instead of replacing the drum?

Some Brother models have a reset button on the drum unit itself, but this only extends the drum's life temporarily — it doesn't actually replace the worn-out part. Once pages show visible defects, resetting won't fix them. Replace the drum when you see streaks or lines, not before.