Hi !!!,
My problem was that the bolt was broken (being inside the thread), I could not extract it by its normal output … then I observed (through the hole in the brake cable and with the help of a flashlight) that the thread was not blind, continued through the another extreme … I made a hole to access the bolt on that side to extract it out there … drilling with a 1mm cobalt in the center of the bolt to form a “line” where I could hook the screwdriver … after extract the bolt i closed the hole with special putty for metal … a little adventure …