Hello. And again a question. After it has been clarified with the tires (there are of course 2 new ones) , my friend (the man with a clue) and me (the carrier) wanted to put us on the brakes. Had a quite bad braking performance on the rear. At the front was quite ok. Nevertheless, today we installed 4 new coverings. After the airing of the system, however, it was not better at the front. And at the back I suddenly had no pressure ( please do not look too closely with the “technical terms”. After that it was better and in the front there was a big improvement to notice, even by airing out eternally, nothing changed. One builds up ( by long pumping of the brake lever ) pressure, brake performance well available. As long as one holds the lever pulled, the pressure remains. However, as soon as one lets go and starts to pull the lever without effect to the grip. Zero braking effect. But if one pumps again about 10 sec relatively fast, builds up pressure on or a good braking effect again. This is how the game works all the time. Could it be a defect of the saddle? The pistons didn’t really move properly even after cleaning. Brake fluid doesn’t exit anywhere. Where does the pressure get lost? Air in the system I rule out. At least everything was okay after airing.