Preparations For Brazing/Tinning

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2013 BMW 128i, 2012 BMW 128i, 2011 BMW 128i, 2010 BMW 135i, and 2010 BMW 128i. However, it is still accessible from the selected car via links, so may be relevant.

Heat brazed joints to be opened with an autogenous flame. Lift off remaining metal and remove remaining brazing solder with a wire brush.
Remove the paint and zinc coating in an area of approx. 30 mm around the seam to be soldered.
Remove the paint and zinc coating in the tin-plating area and approx. 30 mm beyond.