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In non-corrosive flux brazing the flux contains a eutectic mixture of K3AIF6, and KAIF4, which starts to melt at around 560°C. The melted flux disrupts the existing oxide film on aluminium alloys and suppresses further oxidation thus maintaining fluidity of the AI-Si based brazing alloy. To facilitate downgauging there is a drive to develop higher strength core alloys. Using alloys with an increased level of magnesium will readily achieve significant improvements in post-brazed strength, however, the brazeability of alloys containing high levels of magnesium deteriorates as a result of magnesium reacting with the flux to form a higher melting point compound, which inhibits fluidity of the molten cladding alloy. This paper discusses the influence of brazing conditions to increase tolerance to magnesium in core alloys.