To check toner levels on a Brother printer, access the printer's control panel menu. Navigate to the "Ink/Toner" or "Supplies" option. Select the specific toner cartridge to check its level. Some Brother printers feature a digital display indicating remaining toner levels, while others may provide a printed report. Additionally, users can check toner levels through the printer driver software on a connected computer. Brother printers may also alert users when toner levels are low,