The Parking Brake on the PT-425 is the PARK position on a car's AT. PARK is not designed to stop a car, just keep it from moving. Same on the PT-425!
When, or if, you do become a PT-425 owner, you will soon learn that the treadle system works very well. Usually just letting off on the Forward Pedal is all that is needed for a nice smooth stop. For an even quicker stop, or going down hill, some Reverse Pedal will do the trick. Being able to smoothly go from forward to stop to reverse to stop to forward to etc is so much better than trying to brake, clutch, shift, brake, clutch, shift, etc, that it is difficult to believe until you have actually done it in uneven field conditions! After using my PT-425 for 125 hours on various terrain with several attachments, the controls have become completely intuitive, just like driving my car.
Recently I was filling a narrow 3" wide ditch with crushed stone from the steep uphill side while making sure that none of the stone spilled into the dirt piled on each side. With 700# in the bucket, I was able to slowly approach the ditch going downhill forward by using light pressure on the Reverse Pedal. If the bucket extended too far over the ditch, a little more Reverse Pedal brought it back into place. Not far enough, use a little less Reverse Pedal. After gently filling that section, I would retreat back up the hill with more Reverse Pedal, zigzag over 4', then back down to fill the next section. During the entire process I never touched the Forward Pedal until it was time to refill the bucket!
I always felt in complete control! If in the extremely unlikely scenerio that I had lost power or hydraulics, dropping the bucket, or lifting the Parking Brake handle would have brought the PT to an abrupt stop, though perhaps with some minor damage. (Note that the PT can not be moved with the engine off unless the Towing Valve is opened.)
The PT design is safe, and very easy to use! It seems that adding some sort of emergency brake is like carrying a parachute with you on an airliner!! So buy yourself a PT-425! I'm sure that your current fears will quickly dissipate as you marvel at what a great tractor it really is!!
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