Abstract: A windscreen wiper system comprising a frame, a motor driven reducer, a bar drive mechanism and two windscreen wipers one of which has two controlled movements, one for sweeping, the other for extension-retraction. Said system comprises three coaxial shafts journalled to the frame, the arms of said two windscreen wipers are carried by two of said shafts which drive them with sweeping movements in the same direction, the extension-retraction is controlled from the third shaft driven with a reciprocating movement of the same frequency as the other two but in the opposite direction and said drive mechanism comprises three rocking levers fixed respectively to each of said coaxial shafts.