Re: Master cylinder bore size question
[Re: Neil]
#2543544
08/30/18 06:17 PM
08/30/18 06:17 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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If you have a 70 style front disc setup, it used a 1" bore master
The 73 style discs used a 15/16" bore manual or a 1 1/32" bore power M/C.
If you were putting a 73 style disc setup in the 70, just use the complete 73 setup in front.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Master cylinder bore size question
[Re: Neil]
#2544310
09/01/18 04:10 PM
09/01/18 04:10 PM
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Joined: Jan 2003
Posts: 3,675 South San Francisco, Ca
70sixpkrt
master
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master
Joined: Jan 2003
Posts: 3,675
South San Francisco, Ca
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I was using a 1 1/32" master cylinder and the pedal was high and very hard. Switched to a 15/16" and now the pedal goes down more and feels a little spongy. I like this better.
Last edited by 70sixpkRT; 09/01/18 04:11 PM.
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Re: Master cylinder bore size question
[Re: DoctorDiff]
#2544374
09/01/18 07:34 PM
09/01/18 07:34 PM
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Joined: Jan 2003
Posts: 3,575 The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Spongy brakes are solved by installing residual valves. I have a modern 15/16" MC on my '73 Dart on which I installed res.valves in both front and rear line (2 lbs valve in front / 10 lbs to rear). This helped and firmed up brakepedal-feel. But it also caused the fronts to grab the disc to hard at rest. Difficult to rotate the wheels when jacked up. It cost me a full mpg in economy too. Removed the front res.valve helped release thme again and get my lost mpg back. But the calipers got a bit more spongy again. Actually, the 73 style discs used a 15/16" bore POWER or a 1 1/32" bore MANUAL master cylinder.
This is bass-ackward from what seems logical. Probably the brake pedal/MC strut is in a different hole which changed its ratio.
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Re: Master cylinder bore size question
[Re: BcudaChris]
#2610190
01/22/19 12:11 AM
01/22/19 12:11 AM
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Joined: Jan 2003
Posts: 30,947 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 30,947
Oregon
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Does anyone have PN's for a 7/8" or 15/16" bore 2 bolt MC that will fit four our purposes? I ordered a 15/16" listed for a minivan, and the push rod was too large for the socket. Of course, not returnable after opening the bag. Doctor Diff has them.
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Re: Master cylinder bore size question
[Re: Neil]
#2610197
01/22/19 12:19 AM
01/22/19 12:19 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Ended up picking up a nearly complete small bolt Kelsey Hayes setup off a 71 Demon yesterday. Master cylinder part number says 1-1/32" It needs rebuilt for sure. It needs to be rebuilt? Who has their M/C rebuilt nowadays except for the restoration guys?
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Re: Master cylinder bore size question
[Re: Kern Dog]
#2610317
01/22/19 10:03 AM
01/22/19 10:03 AM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Ended up picking up a nearly complete small bolt Kelsey Hayes setup off a 71 Demon yesterday. Master cylinder part number says 1-1/32" It needs rebuilt for sure. It needs to be rebuilt? Who has their M/C rebuilt nowadays except for the restoration guys? Guys who are tired of poorly made foreign junk.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Master cylinder bore size question
[Re: AndyF]
#2610448
01/22/19 03:16 PM
01/22/19 03:16 PM
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Joined: Mar 2005
Posts: 403 Colorado front range
BcudaChris
mopar
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mopar
Joined: Mar 2005
Posts: 403
Colorado front range
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Indeed he does. I got my adapter plate and other specialty items from him over the years, and my car will be wearing his Viper setup when I get to big brakes. Unfortunately, my budget balks over the premium he is compelled to charge for such things. I totally get the economics of the business model, and swing as much of my cash as I can to the good Doctor, you Andy and other vendors that keep the Mopar community getting faster (and properly slowed with their passion, dedication and engineering skills, and by bringing products to market so us weekend wrenches spend more time wrenching and driving, and less time playing engineer, fabricating and sorting things out.
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