Windscreen washing system does not work at the front, but at the rear

Moin Together, the little one annoys me again. Slice washer is not working, just in front, I noticed now, driving little and rarely. The pump was often not working, but always when I pulled off the plug at the front of the wiper container and put it on again, it went again. Now, I went under the car again, the same procedure as always, but nothing…. But at the back the washer is going, so it is on the lever. Steering wheel lining down and wiper levers removed, opened and cleaned. In the lever is a small white plastic cylinder, which presses on a copper flag and thus creates contact for the windscreen washing system in front. Did I also test this, it clicks when I place the contact, but at the front no water comes out, only behind. Are there 2 pumps in there? You can hear that click on the steering wheel, but the pump at the front does not run. When I operate at the rear I hear the pump in front. Do I go wrong? For the upcoming season is really stupid without washing water. Suggestions? Thanks V40, 115PS, automatic from 1998 with 271000km