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Old October 17th, 2015   #1
GaryV
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Default Help - proportioning control valve won't bleed

I recently acquire an ST1300 and decided to freshen up the fluids. I changed the coolant, clutch fluid, and front master cylinder.
I removed the left front caliper, shimmed it, and hung it to ~15 deg.
With my vacuum system at 20, I opened the proportioning control valve and nothing came out.
I read it may take a 1/2 turn or so before fluid came out. I had it backed out many full turns and still nothing.

What the heck is going on? Why won't it bleed? I don't want to go onto the other valves, but I don't know what to do about this one.

The secondary MC seems to move freely.

Please advise.
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Old October 17th, 2015   #2
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Default Help - proportioning control valve won't bleed

I've never been able to bleed that valve the way the manual says either. I just press the rear pedal instead. That will flush it well.


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Old October 17th, 2015   #3
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Default Re: Help - proportioning control valve won't bleed

Thanks. I was leaning on the rear pedal as well, but nada. Nothing coming out.
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Old October 17th, 2015   #4
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Default Re: Help - proportioning control valve won't bleed

Resolved.

There must have been some nasty ooze in the fluid causing some serious resistance as I was leaning on the rear pedal pretty hard with nothing coming out. I went ahead and bled a few other valves and came back to the PCV, still no luck. It wasn't until I bled the last valve on the rear and then tried the PCV again. SUCCESS! Just a 1/2 turn and pushed on the rear pedal.

I then went back and re-bled the valves that are after the PCV.
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Old October 17th, 2015   #5
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Default Re: Help - proportioning control valve won't bleed

The is a very specific sequence that must be followed.
Well outlined in the manual.

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Old October 17th, 2015   #6
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Default Re: Help - proportioning control valve won't bleed

After I finally got the PCV bleeding, I followed the manual sequence which meant that many valves were bled twice. Yep, went through quite a bit of brake fluid.

The frustrating part was initially nothing was coming out of the PCV.
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Old October 17th, 2015   #7
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Default Re: Help - proportioning control valve won't bleed

PaulRB you changed your avatar. Good choice. I lived in the DFW area in the 80's. Southwest Texas is really good riding now.
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Old October 17th, 2015   #8
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Default Re: Help - proportioning control valve won't bleed

Back to the original.
The clown congress comes out only when they get particularly stupid.

This is the start of our serious riding season, slightly late this year.
If the El Ninja, whatever they call it, will cooperate we should be good to go until mid May then it's head uphill till July.
Sometime in July it's service, park and plot route till October.
We make a few exceptions for 9,000 feet and above but generally August, September, we tell all about being there and doing that.


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Old October 17th, 2015   #9
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Default Re: Help - proportioning control valve won't bleed

Quote:
Originally Posted by GaryV View Post
After I finally got the PCV bleeding, I followed the manual sequence which meant that many valves were bled twice. Yep, went through quite a bit of brake fluid.

The frustrating part was initially nothing was coming out of the PCV.
When you say your vacuum system Hand Pump or Air?

I use the MightyVac air bleeder.
I have it regulated to 15psi.
I find at much higher psi it moves the fluid so fast it can create bubbles. I dialed it down to 15 and the bubbles stopped.

Have you noticed anything similar?

Would not help you out if you had the gunk in the lines though.
Brake fluid is cheap. Lots used usually delivers a good flush.

Paul
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Old October 18th, 2015   #10
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Default Re: Help - proportioning control valve won't bleed

If you have the same problem next time, you might try doing it the old fashioned way without a vacuum pump. I did it that way and never had a problem bleeding the PCV.
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