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Stick the bleed block in then repeatedly depress the leaver to the bar in an attempt to burp the bubble back up to the reservoir. Will work better with everything off the bike and the leaver directly above the calliper with a straight run.
Failing that using a syringe you could force fluid in to the calliper in the hope that it takes the bubble/s with it. up towards the reservoir.
Howard
@motoko
Somehow managed to migrate a bubble from the top of the shifter into the hose / caliper. Braking force has disappeared. R8070
Bleed ports are buggered on shifters so can't open them up and am currently awaiting new shifters under warranty. Anything I can do to try to either get the bubble up to the top or out by only using the bleed port on the caliper?