Preparations For Brazing/Tinning

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 335xi, 2010 BMW 335i, and 2010 BMW 328xi. 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.