After recently replacing a rear wheel caliper and attempting to flushing the brake fluid using the vacuum method, which did not work worth a dam producing nothing but constant bubbles in the fluid, I hit upon the use of clear tubing which fits tightly around the bleeding nipple then a short runner, about 1" and forming a loop like O taking the fluid off the top to the used fluid container. Reverting to the time proven two person method you can easily see when the fluid runs clear and a box wrench just fits over the tubing to engage the bleed screw. P.S. The vacuum method producing bubbles is caused by pulling air pass the threads of the bleed screw in most cases.
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