| Re: [GMCnet] Can booster hold vacuum and not boost [message #324744] |
Mon, 09 October 2017 12:01 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Senior Member |
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When you have exhausted all the remedies but one, and still have the
problem, it pretty much tells you where to look next. The original
distribution valve is made for combination disc/drum systems. If you have
rusty crud in your master cylinder, you will have it in the distribution
valve also. If it is frozen up, replace it. It is a pain in the a##, and
you will twist off at least one brake line, but, that is the nature of the
beast.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Oct 9, 2017 9:49 AM, "Thomas Phipps" wrote:
The little OEM iron brake valve that you did not replace can be the source
of many varied problems. If you do not have one, get the brass one to
replace it. The iron valve can rust into permanent position and appear to
be okay, but the internal valve will not slide and do it's job. At least
push the pin on the front of the valve and see if it moves. No movement,
it's toast.
Your description of the problem sounds like air in the lines.
Tom, MS II
--
1975 GMC Avion
KA4CSG
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