In a pressure cooker, cook pork chops in oil until lightly browned on each side; drain. Remove chops; sprinkle with salt and pepper. Add sauerkraut to cooker; sprinkle with brown sugar. place pork chops and potatoes over sauerkraut; add water., Close cover securely; place pressure regulator on vent pipe. Bring cooker to full pressure over high heat. Reduce heat to medium and cook for 15 minutes. (Pressure regulator should maintain a slow steady rocking motion or release of steam; adjust heat if needed.) Remove from the heat. Immediately cool according to manufacturer's directions until pressure is completely reduced.