| [GMCnet] OEM Master cylinder liquid capacity & piston [message #120929] |
Tue, 05 April 2011 10:29  |
paul h cashman
Messages: 176
Registered: May 2005
Karma: 0
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Albert,
I plan on going to Patterson.
I have a 1978 OEM Master cylinder I replaced with one from Jim Bounds .
The new one put out over 1500 PSI dead headed into a Gauge.
The Gauge I was using ,Max rang was 1500 PSI and it pegged ,the Meter.
Paul Cashman
Riverdale GA
Hey Craig ,
Thanks for the offer to do the measurements, I think it best to buy the
1978 one from somewhere and measure it . Looks like my OEM MC has 1-1/4"
pistons which I have long suspected due to only getting just over 800 PSI on
a pressure test about 3 years ago. I'll just hold for now and pick up one
on the way home from Patterson.
Cheers.....Albert
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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] OEM Master cylinder liquid capacity & piston [message #121032 is a reply to message #121031] |
Tue, 05 April 2011 23:10  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Bob,
In following this thread I read that Bob Drewes noted:
"Albert;
You are probably aware of this, the '78 had the second design MC and some of
the changes were in the pistons and perhaps the stroke. I seem to recall it
had slightly larger volume than the 1st design.
Bob Drewes"
Can you provide any more details vis-à-vis "la mystique" of this unit? ;-)
Does "la mystique" make it more desirable than the '73 thru '77?
Thanks,
Rob M.
USAussie - Downunder
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Bob de Kruyff
Sent: Tuesday, April 05, 2011 9:45 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] OEM Master cylinder liquid capacity & piston
There's some mystique about the 78 master cylinder so actual data would be
great, however, how do you know for sure that it is a 78. They are difficult
to come by and I think Cinnabar is the only one that has them.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] OEM Master cylinder liquid capacity & piston [message #121059 is a reply to message #121032] |
Wed, 06 April 2011 11:12 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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Rob, a few years ago I tried to find more info on the 78 M/C. At that time Cinnabar was the only source at quite a premium. I have a 78 but assume that the original M/C was long gone. The manual only mentions "increased capacity" but that doesn't explain much but only raised more questions. At that time, nobody could explain what was different about it. This is the first time I've heard anything about different piston sizes and it sounds very interesting. Given that many mods are boing made to these brakes it sure will be interesting to learn more about the 78 specs.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] OEM Master cylinder liquid capacity & piston [message #121064 is a reply to message #121059] |
Wed, 06 April 2011 11:52 |
bumpersticker
Messages: 60
Registered: February 2004
Location: Redondo Beach, CA
Karma: 0
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I attended a Tech session on brakes at a Western States rally back in the mid 90's. During a Q&A session Wes Caughlin was asked what the difference was between the 78 and the earlier M/Cs. The answer was a part number change to accommodate the heavier weight of the Coachman Royal. It seems it was only a paperwork change
to help Coachman with their sales. It seemed likely story since we were unable to find any difference between the M/Cs.
Bob Cook
78 Birchaven
75 Avion (In work)
Redondo Beach, CA
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