Know some of the posts are older, but this apparently is still an ongoing issue, so hopefully this helps someone.
After being frustrated by this since setting up MSFS, and having read the comments of others here, I have a solution that, so far, has worked fine for me.
As others have said, it's a rudder/brake calibration issue.
I'm using Thrustmaster T-rudders, but hopefully the following applies to those using joystick rudders and brakes.
The problem I have here is MSFS can't work out what the centre point of the brakes are on the rudder pedals. So, keeps automatically kicking in brakes after landing and taxiing, and as others point out, you keep having to turn the park brake on and off every time, which is a pain in the butt.
So, I calibrated my rudders as follows:
First, make sure nothing else in MSFS on the keyboard or mouse is set to utilise brakes, toe or park, apart from those you specifically want to use.
Open Windows setting, and search for "controllers"
Click "Set up USB game controllers"
Click on the controller (in my case, my T-rudder pedals)
Go to "properties", "settings", "reset to default" (although you might reset other stuff if not using dedicated rudders, so maybe skip this step), "Calibrate".
In the "Welcome to the device calibration wizard" and click "next"
It says "Find Center point. Leave handle centered and press a button on the controller". Rather than leave brakes off, I pressed the toe brakes on both sides of the rudders ON, then while pressing them, clicked "next". I assume if you're using joystick, hold the brake button on (regular, not park brakes), and click next.
In "Axis calibration", move the tow brakes without moving the rudder pedals themselves several times to set limits, then press "next"
In "Verify Center Point" again hold brakes on (rudder R+L for rudder pedals) and while holding them on, press 'Next"
For Z axis calibration, slide rudder pedals forward and back as normal to set limits, then press "next"
Finally, click "Finish" then "Apply"
I've tested this multiple times, and every time I do, both the toe brakes and park brakes work properly when taxiing and trying to taxi from a standing stop after landing, or after applying toe brakes. When I calibrated without the brakes held on to center, the problem recurred.
This has fixed it for me, and I'd be interested if it works for others too, as well as those without dedicated rudders, as it's been a damned ongoing nuisance.
Cheers
Rocko