Im a young man and new tractor owner. Got a new L2501 just weeks ago, not even 8 hours on it yet. I made this mistake on like day 2 of owning the machine. Whats worse is I actually heard the extra whining from the HST and thought to msyelf "God this thing seems too noisy..." Thankfully I only got about 100 yards before I realized the error. I think the problem, at least from my perspective, is that I never actually use the brake on this machine. Just letting off the HST pedal stops the machine so quickly, that by the time you could even press the brake the machine is stopped already. So, I find myself using it like I do my lawn mower - as if no brake exists, and you just forget that there is a park brake on. Maybe they should make it like my zero turn where the engine will actually shut off when you try to drive and the brake is on. Its just so easy to make this mistake. Im trying now to form a new habbit when using the tractor to always pump the brake right after I start the engine.