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I have a 2019 T-Boss 410. The 4WD switch works, but sometimes the actual physical switching from 4WD to 2WD or from 2WD to 4WD, is slow. I can drive a ways before it will switch out of 4WD and usually after I slow or stop. Have you tried backing up? Also try turning the front wheels back and forth when you stop or back up. I had a 1971 Ford Bronco that I could not shift out of 4WD until I put it in reverse and backed up 20 feet or so. For what it's worth, I find it easier to steer when the Massimo is in 4WD, and it doesn't seem to tear up the lawn as much as it does in 2WD. Sure would be nicer, if it had a rear differential.

If no single tire locks up I would try taking the master cylinder off and flushing it out with new brake fluid. Just let it squirt out and see if it got clogged. If you’re handy then I would take it apart also and check if the seals are still good. It would be odd if all 4 caliper/slave cylinders would all be bad at the same time. Just for the halibut I would also make sure the main brake lines haven’t been crunched by seeing how much brake fluid comes out of each wheel? Do they bleed the about the same amount of fluid? That’s my guess, good luck…..