They're fine if they're kept dry... no good after being washed only thing we really didn't like about our previous scraper tractor.What's wrong with dry drum brakes? Simple operation/maintenance and not likely to wreck the transmission if parking brake left on. Only a 18mph machine.
"Upgraded" to a MF4 which is basically a 135 with a 165 wet braked axle, and drum handbrake, been much better this last winter.