When I first pulled this out of the farmer's yard and brought it to the waiting lowboy to transport back to my place, to brake I dropped the bucket. Slowing down before dropping the bucket, it still took ten feet to stop which underscored to me the importance of getting all six, four-piston calipers clamping onto all four disk brakes. That said, my parking brake is mounted onto a driveshaft, and that type of system is serviceable if it is strong enough for the application. For me, I wanted the stock system up and running so I know the brakes will hold on a hill.A fellow at a local sawmill had brake problems like yours. He mounted a disc brake on the drive line (3/4 ton pickup disc) and used a standard hydraulic master cylinder. That gave him a gear reduction on the braking. It does what he wants, so there are other ways to "Skin the Cat".