Ken Henderson Messages: 8726 Registered: March 2004 Location: Americus, GA
Karma:
Senior Member
Seems to me the pressure drop across the combination valve can only be
caused by the shuttle valve moving at about 500 psi and completely blocking
the rear outlet. Otherwise, the outlet pressure would eventually reach the
input pressure. Only that scenario separates the normally single closed
system into two "independent" systems.
Ken H.
On Sun, Jul 19, 2015 at 7:11 PM, A. wrote:
> Neil Fonville wrote on Sun, 19 July 2015 17:58
>> I have confirmed I have the rear port on the P30 connected to the rear
> brakes. Tested pressure again. Got 800 rising to 900 when holding on the
>> rear MC port. 500 steady at the rear output of the combination valve.
>> Did not have parts to test at the input of the valve.
>>
>> Neil
> You are within a couple shovels of paydirt. You got a 300 - 400 PSI drop
> between the master cylinder and the output of the combination valve. I don't
> know or care how that can even be possible. But you need to figure out
> which component has the evil in it - the line or the valve. Disconnect the
> line
> between the master cylinder and the combination valve and verify there
> isn't anything in it that would restrict flow. Then do the same between the
> input and output of the combination valve. Might need to replace the
> combination valve. Reassemble, bleed the rears one last time, and drive it.
> --
> '73 23' Sequoia For Sale
> '73 23' CanyonLands For Sale
> Upper Alabama
> On "marriage equality": Once you define the direction that society is
> headed as "forward", you can call it progress.
>
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Ken Henderson
Americus, GA www.gmcwipersetc.com
Large Wiring Diagrams
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