Old thread, new member with the same problem. My 2025R was dropped off and the Deere rep put the parking brake on and left. I had exactly the same problem. Push parking brake lever down and the light goes off, but the brake didn't disengage, after a phone call to the Deere rep who was baffled and could only offer to come out the next day to look at it and playing around with it, I found that if I push really hard on the brake pedal, sometimes, the lever will disengage. It has much more travel and a louder click/clunk when it disengaged. It feels like the plastic handle on the lever could break each time because it takes a lot of pressure. I'm able to use the tractor but it's always a battle to get the parking brake disengaged. The tractor has to be go back in to be setup with the backordered MMM when it comes in so I'll be looking for them to adjust it.