Motive Power Bleeder - No differnt then gravity? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Old 06-04-2018, 12:12 PM
personalt personalt is offline
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2005 GMC Envoy SLT XUV
Black 4.2L I6 2WD
Join Date: Oct 2010
Location: NJ
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Motive Power Bleeder - No differnt then gravity?

I have a motive power bleeder. I pump it up to 20 psi and open the bleeder. Fluid doesn't seem to come out any faster then a gravity bleed. Pressure in bleeder barely drops after 30 seconds of bleeding. I was expecting it to shoot out a lot faster

Do I need to do anything with the pedal to open the gates inside master cylinder? I was under the impression when brakes are not pressed fluid can flow from reservoir freely(otherwise gravity bleed wouldn't work.)

I was thinking about paying someone to do a flush.. Do they do anything special - ie high speed pump it around to get all the air out.
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Old 08-19-2018, 10:29 AM
Distiller Distiller is offline
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2002 GMC Envoy SLE
Bordeaux Red Metallic 4.2L I6 4X4
Join Date: Jun 2017
Location: Delaware
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The brakes lines are long and very small diameter so don't expect a high flow rate of fluid with 20 psi. Try bumping (open/close) the bleeder if you are trying to get air out of the system. Always bleed the longest brake line first, passenger rear. Getting the old brown fluid out is the main point of bleeding. Yes gas can accumulate if the fluid gets hot, but if you get the old discolored fluid out, you will most likely also get out any gas.
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Old 08-21-2018, 09:15 PM
jimbo7 jimbo7 is offline
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2004 Chevy TrailBlazer LS
Midnight Blue Metallic 4.2L I6 4X4
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Location: st. louis
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I recently pressured bled my friend's jeep. Same slow drip happened. Took the bleeders all the way out and same thing. After a minute or so the flood gates opened up. Turned out the fluid was super old and dirty. And the fact it sat a few years didn't help.
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Old 01-28-2019, 09:53 PM
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Schurkey Schurkey is offline
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2003 Chevy TrailBlazer LTZ
green 4.2L I6 4X4
Join Date: Oct 2005
Location: The Seasonally Frozen Wastelands
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Yup. Take the bleeder screws OUT and clean them. They plug with dirt (very common.)

The hole in the caliper that fluid flows out of may also be plugged with crap. Any restriction anywhere in the system will reduce fluid flow.

I cheat: AFTER cleaning the bleeder screw with a small drill bit turned by hand, I put the screw in the caliper, put a hose on the screw to direct the fluid...then with the pressure bleeder connected to the master cylinder, and the other bleeder screws closed, STOMP on the brake pedal to force the "clots" out. Repeat as needed for any wheel cylinder/caliper that won't flow properly.

If the hose pops off the bleeder screw, you'll have fluid squirting all over.

I tend to use ~15 psi on my pressure bleeder, fluid shoots out the bleeder screw when everything is working properly.
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