parking brake
Upon installing the AN fittings on the matco parking brake I found that I could not blow air through the attached tubes. The valve appeared to work correctly.
I called Matco and they told me to back off on the fitting somewhat. A fitting that was too tight and bottoming out would compress the case enough to cause the cylinder from moving freely thus leaving the assembly either open or closed.
In my case it was stuck closed. The fix worked immediately for me.
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Ernst Freitag
RV-8 finished (sold)
RV-10 Flyer 600 plus hours
Running on E10 mogas
Don't believe everything you know. 
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