The 9540 is as the OP described. No brake lock system. And the way it's designed it would be very awkward for the operator to "ride" the brakes and wear them out. Not sure what happened in this case.Sounds to me like you ran it with the brakes partially engaged. Kubota's use wet multi plate brakes. I have well in the excess of 6000 hours on one of mine and 4000 on the other and never a brake disc issue but then I installed LED warning lights and micro switches on mine so if I forget to release the brakes, the light warns me.
Never seen any Kubota without a brake lock or one that has a 'Park' feature.
Not sure what you looked at Daryl. No brake lock on mine.Like I said previously, you have been driving with the brakes partially engaged. Went and looked at your model tractor and it's just like mine with the above lever to engage the parking brake. (above picture).