| [GMCnet] brake pedal play amount erratic [message #143549] |
Fri, 16 September 2011 09:17  |
paul h cashman
Messages: 176
Registered: May 2005
Karma: 0
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Armand
-----Original Message-----
From: Armand Minnie
Paul, are you saying that the P-30 has a residual pressure valve or that it
somehow causes it from some flaw? It does seem like
there might be residual pressure in the lines but only one caliper seems to
be affected if that is so.
--
Armand
When I released my Brake line lock with a Pressure Gauge installed there was
a residual pressure of 400 PSI on my lines as I applied the Brake Pedal the
pressure kept going up and would not bleed off.
I removed the P-30 Master Cylinder to see if it was causing the problem.
I removed the Reservoir and in the bottom were two spring loaded Residual
Check Valves.
I checked on the Internet and the Master Cylinders ,with Residual Valves,
were Designed for ,an all Drum Brake System ,due to action of the return
Springs.
The OEM Master Cylinder does not have residual Valves.
I'm surprised ,that more People, are not having problems ,with the P-30
Master Cylinder
Paul Cashman
Riverdale GA
78 Transmode
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Paul H Cashman
Riverdale Ga
1978 Transmode
1975 Corvette
1978 Beetle Convertible
1989 Harley Davidson Sportster
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| Re: [GMCnet] brake pedal play amount erratic [message #143551 is a reply to message #143549] |
Fri, 16 September 2011 09:32  |
armandminnie
Messages: 864
Registered: May 2009
Location: Marana, AZ
Karma: 2
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Senior Member |
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Paul, after your comment about the residual pressure I did some research and found what you said, that master cylinders for drum brakes have residual pressure check valves. Since my problem only happens some of the time I doubt that they are in there or, if they are, they don't work most of the time? Where did you get your P-30? The P-30 was used for lots of years, maybe later years didn't have them?
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
visit my gmc blog
click here to visit gmcws.org
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