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#3: 04-04-2013, 07:45 PM
JmP6889928's Avatar
Title: Turbo Monkey
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As I stated, none of the methods are "wrong", depending on who you ask, but I'm not a fan of pressure bleeders and I even own one, including a vacuum bleeder that hooks to an air compressor and generates vacuum to pull fluid through. The problem with pressure bleeders and vacuum bleeders is that they can dislodge any speck that happens to be stuck to the inside of a brake line and force it into the ABS controller or proportioning valve, which can cause a light, which EVERYONE hates. It only takes a spec of .005 micron to foul many of the ABS controllers out today.

I know people that use pressure bleeders, swear by them, and would never change. My personal feeling is that they were developed to make it faster and also make it a one man operation which is a good thing. They were also first developed way before the complexities of today's systems. By using only the weight of the fluid and gravity, there is almost no chance of knocking anything loose or pulling it out of the bottom of the reservoir and forcing it down into the lines.

Brake fluid does not recirculate within the system so the fluid itself doesn't move much other than the floor pedal is pushed to cause the pressure which activates the pistons in the calipers producing force which induces the friction between the pads and rotors and slows the vehicle. (I know, long sentence, but it was done on purpose...LOL).

At least with your Motive bleeder, you use it, clean it, and then put fresh brake fluid in it every time you use it. Most pressure bleeders in service facilities, including dealerships, have NEVER been cleaned and someone pours a gallon of fluid in them and then it may take 6 months to use enough of it to need refilling, which is exactly what happens and the old fluid isn't removed.