It looks like the dealer never topped up the brake fluid. They should have done this during the pdi. All sorted now.
The model I got is the old one. To tell you the truth I prefer the look of the old dash. Also, the service manager agreed that the new model could have the ususal dashboard rattles / creaks like the 147, and as the 156 has been around since late '97, it would probably be a better choice if I was concerned about such things. Of course no asr, or arincon is a minus, but I can live with it, as this 156 feels a lot more comfortable and solid compared to the 147.