Jinman, You were right, It was the lever part of the parking brake that was sticking....just got finished bushhoging 5 1/2 acres and that cruise was nice to have. I'm glad you cleared up the positive traction thing....I was also pushing the lever down as I needed it then releasing....just did'nt know that was the correct way to do it. Does your tractor constantly make that humming sound? The type of sound when your low on power steering fluid in your truck. I checked my oil and its good.