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@PhilDAS
You might be able to braze stainless with brass/bronze and it might be fine for racks but I wouldn't braze frame tubes with it and especially not Reynolds. Reynolds stainless suffers from intercrystaline cracking even at silver brazing temps. The tubes literally crack whilst being brazed. It's a well known problem with 921, to a lesser degree 953. I imagine it would be nearly impossible at the much higher temp needed for brass.