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I don't know whether there's some fancy gizmo that does that but that's how my road Hope brake is bled which was more effective than Shimano's sandwich bag and push method.
A big syringe threads into the brake and you pull up the plunger creating a vacuum and it rather successfully sucks out a bunch of tiny bubbles
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The difficult bit with these if fully filling the lever reservoir. It's easy to leave a pocket of air that then finds its way in to the lines when on the trail. Make sure you follow Magura's instructions on how to position the leaver on the bars for bleeding. If you can remove the brake from the bike and run the hose in a straight vertical line it's easier.
PhilDAS
Howard
@Dammit
Well I have purchased a Total Bleed Solutions kit and will have a crack at doing this myself.
Is there such a thing as a bicycle vacuum bleeder? It seems that the problem with my rear Magura is that no-one can get all the air out, so a vacuum bleed might make sense.