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Old 11-19-2009, 06:12 PM   #1 (permalink)
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Default full brake fluid flush / replacement with VDC

It's time to flush the brake fluid on my 2001 OBW VDC...

...and I'm a detail-oriented kinda guy........so I want to flush ALL the brake fluid from the system, including the old stuff in the VDC unit valves & chambers & reservoirs...

So I need to ask the brake gurus in this forum:

1) Should I run the VDC sequence control (pressure increase) or the ABS sequence control (pressure decrease) or both?

2) How long / how many cycles should I run the sequence control?

3) When should I run sequence control? After a partial bleed? During bleeding? After a full flush?

I'm leaning towards partial flush + VDC sequence control + full flush, but I'm not sure. Are there any expert Suby mechanics here who could dispense their wisdom?

Thanks very much in advance...

-Jeff
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Old 11-19-2009, 06:52 PM   #2 (permalink)
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www.endwrench.com in the archives covers brake flush/bleeding procedure.


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Old 11-19-2009, 06:56 PM   #3 (permalink)
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Quote:
Originally posted by nipper
www.endwrench.com in the archives covers brake flush/bleeding procedure.
I've read the endwrench articles already. They cover some of the stuff from the service manual, but they don't answer these questions. Unless I missed something...

-Jeff
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Old 11-19-2009, 07:02 PM   #4 (permalink)
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http://endwrench.com/images/pdfs/BrakeFluidSumm02.pdf

Is it just me. or does that contradict itself in spots?


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Old 11-19-2009, 07:09 PM   #5 (permalink)
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To clarify...

1) The Winter 2001 "Brake System Flushing & Bleeding" article mentions a detailed procedure for TCS systems, which I think (??) predate my VDC system??

2) The Summer 2002 "Brake Fluid Change" article mentions ABS sequence control to test the ABS unit (with a pressure gauge) after you have changed the fluid.

...but neither of them talks about how to flush the ABS or VDC control unit valves/chambers/reservoir.

I also took a look at Subaru's training module for brake systems. No luck.

Is there another article that I should read? Or, should I just forget about this and let the VDC unit stew in its old juices?

Thanks for your help!

-Jeff
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Old 11-19-2009, 07:15 PM   #6 (permalink)
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I'm getting attacked by flying pigs, so i will let someone else answer. I would just do a normal bleed/flush starting at the closest wheel first.


someone send chicken soup.

**** pigs with wings.




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Old 11-19-2009, 07:39 PM   #7 (permalink)
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Hehe...I hear ya. Still dreaming of a world without flying pigs.

It all changes so sloooowly. Maybe in 2 or 3 more generations. I hope we live to see it.

-Jeff
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Old 11-19-2009, 07:59 PM   #8 (permalink)
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Quote:
Originally posted by driveby
Hehe...I hear ya. Still dreaming of a world without flying pigs.

It all changes so sloooowly. Maybe in 2 or 3 more generations. I hope we live to see it.

-Jeff
i wonder what is next *cough cough* the buffalo flu, or did we de-wing all of them.


(apologies if i sounded irked before, i really feel like biomass)
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Old 11-21-2009, 10:57 AM   #9 (permalink)
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bump!

Has anyone out there done a full ABS/VDC flush like this?

No buffalo, please.

-Jeff
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