Quote:
Originally Posted by Kenth
Change the fluid is best done by the "two person" method or pressurize the master cylinder or using the vacuum method at the bleeder valve.
The bad fluid needs to be pushed or sucked out of the system.
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Whenever I've done brakes that were old or cruddy and the customer didn't want to replace the parts, I pull the bleeder screw, clean it out, and attempt to clean out the bottom of the wheel cylinder or caliper of as much as I can (or at least free up the hole). Once I've done that I get clear plastic tubing and a coke bottle, stick clean brake fluid in the bottom to cover up a significant portion of the bottle and hose, then push the pedal inside the car to force nasty fluid and trash out. Once the fluid flows out of the bleeder into the hose cleanly, that side is done and I repeat with clean fluid for the remaining bleeders. Then I finish it up with a gravity bleed to make sure the air bubbles are gone and the pedal is nice and firm.
Takes longer, but it gets done right to me and the fluid is all fresh inside the lines and the majority of the trash is gone.