Self locking joint between a ball head actuating rod and a flat part

The device has a latch (11) and a pusher (20) that comprise a fixation unit fixing the latch on the pusher by sliding along a direction perpendicular to a longitudinal axis of a control rod (1). The fixation unit comprises a rectangular plate (15) having a central orifice (15a) provided in an extension of a cavity (12). The orifice is disposed at an end of the latch which is opposite to flexible tabs (14). An independent claim is also included for a motor vehicle comprising a control rod e.g. brake servo unit, and flat part e.g. brake pedal, connection device.