The Peugeot 309 Break was a concept estate built by the French coachbuilder Heuliez, based on the platform of the production Peugeot 309. Its most distinctive feature was an asymmetrical door layout, with a single door on the left side of the car and two doors on the right, plus a rear hatch. A similarly asymmetrical door concept had been proposed by Toyota in 1985 on its experimental AXV family car. The design also served as an evaluation model for a conventional three- or five-door estate version of the 309, a common practice in styling studies where each side of a car is finished differently for comparison purposes.
The wheelbase remained unchanged from the standard five-door 309, but the rear side door was reshaped above the beltline, allowing the roofline to rise slightly toward the rear without resorting to the styling solution used on the Citroën BX Break. This produced a load volume of 1.6 cubic metres, notably greater than that of the Peugeot 305 Break, even though the Heuliez 309 Break measured only 406 cm in length, 22 cm shorter than the 305 Break, which continued in production until 1989.
The body was a four-door estate configuration, with one door on the left, two on the right, plus a tailgate, and seating for five. It used the Peugeot 309's four-cylinder, 1905 cc engine. Dimensions included a wheelbase of 247 cm, track widths of 141 cm and 137.5 cm, and overall length, width and height of 406, 163 and 149 cm respectively.
