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Well, I'm no brake expert. That said, when the calipers and wheel cylinders are retracted to allow new pads and shoes, the old fluid pushes back up into the master cylinder anyway. By removing that spent fluid (suction cylinder), then using a pressure bleeder to push new fluid into the M/C, through the lines, and into the calipers/cylinders, new fluid from top to bottom....I'm thinking about getting one but pushing the old fluid (& dirt) towards the master cylinder/ABS unit seems like it would make things worse.
What do you think?...