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One way to braze aluminum is to heat the part while rubbing the rod on it until the rod just starts to melt. Then use the melting rod to scrape the veed out joint, so that you break up the aluminum oxide. The melted rod prevents oxygen from getting to the joint so the oxide doesn't re-form. Then get the heat down to the plastic temperature for the rod and fill the joint. You can also use a stainless steel wire brush to help break up the oxide layer, rather than just the rod itself. No flux is used for this.
But I've been through this, and for a foot peg that could cause a crash if it broke at the wrong time, I'd either TIG it or buy a new peg. Unless you've done this process many times and have that experience, you really won't know that the joint is truly cleaned of oxide, so it may or may not be as strong as the base metal.
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