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residual valve?
#328738
05/25/09 10:49 PM
05/25/09 10:49 PM
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Joined: Mar 2008
Posts: 553
Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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I have a four wheel disc master cylinder I am thinking of trying to install on the Duster. I am running disc front/drum rear. Do I need a residual valve for the rear? I will mount in the stock location.
'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: residual valve?
[Re: bigtimeauto]
#328742
05/26/09 06:17 AM
05/26/09 06:17 AM
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Joined: Mar 2008
Posts: 553
Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
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>> In the mid-1970s, Chrysler eliminated the rear brake residual pressure valve from the master cylinder. Its function was to prevent any air from sneaking into the system via the rear wheel cylinder cups. In its place, Chrysler substituted "expanders" in the rear wheel cylinders. (Expanders are dish-shaped steel inserts that exert outward pressure on the cups.) If you should decide to use a master cylinder from a 1975-up car, be sure you have the expanders in your rear wheel cylinders. For at least 20 years they have been universal in all replacement wheel cylinders and rebuild kits.
This is from a Mopar Action tech article. My car is a '75. Does anyone have a picture of what these would look like (expander vs. nonexpander)?
'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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Re: residual valve?
[Re: Cab_Burge]
#328744
05/27/09 06:31 AM
05/27/09 06:31 AM
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Joined: Mar 2008
Posts: 553
Kentucky
clovis
OP
mopar
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OP
mopar
Joined: Mar 2008
Posts: 553
Kentucky
|
does the residual valve have to be mounted on the MC or can it be mounted anywhere in the line?
'75 Plymouth Duster
Phase I 451 906/590/2-660 10.75/126
Phase II 451 Stage VI/590/1050 9.82/135
Phase III 383 906/Victor-Pump gas 11.30/119
"For by grace you have been saved through faith. And this is not your own doing; it is the gift of God,"
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the residual valve helps prevent the drum brakes return springs from pulling the rear shoes all the way in so the rear cylinders are collasped or completely bottom out 
Wilwwod sells them with the fitting, you will need a doulble flairing tool also