My brake has notches, 1st notch is pretty light and I can drive around with the brake set on. The second click on the brake is set pretty hard. I normally push the brake with the right foot and I use my left foot to engage the parking brake lever to set it (got tired of bending over to lock the brake).
There is also an easy adjustment to tighten up the brakes. Looking under the tractor and move the brake pedal and you'll see where you need to adjust. There is one lock nut, loosen it, spin the middle section (works like the top link screw). Need to do both sides. I just tighten up my friend's brakes a couple weeks ago...