Hello, I have a big problem. I should change all the discs and coverings for a friend. That was also no problem until I found out that the dust sleeve was defective at the rear left and the piston was stuck. So I ordered a new sealing kit, cleaned the piston and rebuilt it again. The piston then turned on with the matching tool under slight pressure. Now the brake is completely mounted again and I have ventilated everything. Only now comes the problem. The hand brake does not want to tighten on the driver side. What I did wrong. Can someone help me. Can the automatic parking be defective. What can I check to see what is defective. The normal brake works perfectly I mean. Was not yet on the brake test stand. Thanks in the front of the brake test stand.