The problem was: When I replaced all the seals of the caliper I tried to dismantle the caliper as much as possible, hence, I also had the "lever" removed. When I put it back on, I placed it one tooth-width (there are tiny teeth on the bracket under the screw) too much clockwise. Due to that the brake cable could not engage the emergency brake on the left side. Also note: During reassembly put the spring into position FIRST, and only then rotate the bracket into position to fit the 2 bolts (would