Brother's scan app is iPrint&Scan, but on Windows it's a genuinely separate install from the driver package — you need both, in the right order, or scanning won't work even though printing does.
Go to Brother's official support site, search your exact model, and install the Full Driver & Software Package before anything else. This is a genuinely required, separate first step on Windows — iPrint&Scan alone won't work without it, even though the two might feel like they should be the same download.
On Windows, download iPrint&Scan from the same downloads section on Brother's site (it's listed separately from the driver package). On Mac, get it directly from the App Store instead. On mobile, it's in the App Store or Google Play.
Open iPrint&Scan — the app should detect your Brother printer automatically over Wi-Fi if both steps above completed correctly. If it doesn't, the most common cause is the driver package from Step 1 not having installed fully; worth reinstalling that before troubleshooting the app itself.
If your printer and Android device both support NFC, you can tap your phone directly against the printer's NFC mark to connect instantly, skipping manual network setup entirely. This only works on compatible Android devices — iOS doesn't support this particular shortcut, so iPhone users will need the normal Wi-Fi-based setup instead.
Load your document, open iPrint&Scan, and use the Scan section — you can configure and save frequently-used scan settings as a preset, so repeat scans (like a recurring weekly form) don't need reconfiguring every time.
If you want to start a scan directly from the printer's own control panel button rather than opening the app first, Mac users specifically need one more small piece: the iPrint&Scan Push Scan Tool, installed separately alongside iPrint&Scan itself. Without it, the printer's scan button won't have anywhere on your Mac to send the file.
See the full Brother Wi-Fi connection guide first if you haven't gotten this far yet.
See the Brother Wi-Fi setup guide