I've got a solution which works: stretch the spring in the Jamar master
cylinders so that the finger brake levers return to their starting
position with vigor. When the spring returns the lever slowly then
blowing bubbles out of the system can't be done because the bubbles
ascend in the fluid in the long brake lines faster than the master
cylinder replenishes. When a stronger return happens, brake fluid from
the reservour is sucked more vigorously back into the master cylinders
allowing the lever to be pressurized again quickly thus forcing the
bubbles more quickly down the long brake line of a tri-gear.
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