Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: burdar]
#2940912
07/07/21 06:00 PM
07/07/21 06:00 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
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T/Anks a million!!! I'll decide further!!!!
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: NITROUSN]
#2940913
07/07/21 06:00 PM
07/07/21 06:00 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
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T/Anks for the reply... I'll let you know what I decide.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: NITROUSN]
#2940920
07/07/21 06:10 PM
07/07/21 06:10 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
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There's a top black wire... and side/center black wire... not sure which does what, but at least one of them activates the dash brake light. The car is actually a '72 model (cloned into a T/A a long time ago... by me) Here is the link to Dr Diff's site that he suggests to get his drum-drum prop valve (that can be used for disc-disc setups). https://www.doctordiff.com/brake-valve.html
Last edited by Mopar Mitch; 07/07/21 06:14 PM.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: convx4]
#2940956
07/07/21 08:45 PM
07/07/21 08:45 PM
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Joined: May 2019
Posts: 6,324 nowhere
Sniper
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So a car that originally had all drums is upgrades to disk all the way around will not need the proportioning valve changed ? Not even gutted? What master cylinder is used ? The drums one or a disk brake one? all drum systems do not use a proportioning valve. That is handled by wheel cylinder size, shoe size, drum size or a combo of those factors. A properly setup all disc system will account for it in rotor sizing, caliper bore size, pad size or a combo of those factors. An aftermarket all disc setup will most likely need a proportioning valve because most of them are NOT properly setup. All that "valve" is in an all drum setup is a splitter and in some cases a brake warning light switch. To which you will most likely need to add an adjustable aftermarket proportioning valve to adjust the aftermarket all disc setup to work properly. As in the rears don't lock up first.
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: NITROUSN]
#2941221
07/08/21 02:58 PM
07/08/21 02:58 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
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Nitroism -- the valve on my car is original... and there are similar others that also have the two wires.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: convx4]
#2941222
07/08/21 03:00 PM
07/08/21 03:00 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
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Convex -- From what I've been learning, yes... drum-drum setups truly don't need a prop valve, same as disc-disc... no need. I wish this were in writing from vendors.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: Sniper]
#2941226
07/08/21 03:08 PM
07/08/21 03:08 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
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Sniper -- I believe you're correct with the info.
I've also learned that rear adjustable prop valves are more truly needed for light-weight rear-end cars... heavier cars can do away with any need for such a prop valve when brakes are same design (drum-drum or disc-disc).
Perhaps, it wouldn't hurt to have an adjustable prop valve (used only for the rear)... but the need would have to be determined by brake testing... i.e.: rear lock-up. I'll determine that as I progress with the brake swapping..... possible Wilwood front calipers.. or swap to the front Viper setup from Dr Diff.... pending how my other rims fit over the setup.
Note: My master cylinder is an aluminum Mopar unit (new) from an ~1980s pick-up... installed many years ago as a weight-savings vs the original heavy cast-iron unit.... has been A-OK for me.
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: Mopar Mitch]
#2941275
07/08/21 04:46 PM
07/08/21 04:46 PM
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Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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Nitroism -- the valve on my car is original... and there are similar others that also have the two wires. I do not think that is correct. My FSM only shows one wire. I would like to see the end of that valve with the wire unplugged. To me that wire is attached to a valve end and not a switch. FSM shows one wire going from the valve to cavity 24 on the bulkhead.
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: Mopar Mitch]
#2941287
07/08/21 05:16 PM
07/08/21 05:16 PM
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340SIX
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Doc Flappergas's Evil Twin
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Sniper -- I believe you're correct with the info.
I've also learned that rear adjustable prop valves are more truly needed for light-weight rear-end cars... heavier cars can do away with any need for such a prop valve when brakes are same design (drum-drum or disc-disc).
Perhaps, it wouldn't hurt to have an adjustable prop valve (used only for the rear)... but the need would have to be determined by brake testing... i.e.: rear lock-up. I'll determine that as I progress with the brake swapping..... possible Wilwood front calipers.. or swap to the front Viper setup from Dr Diff.... pending how my other rims fit over the setup.
Note: My master cylinder is an aluminum Mopar unit (new) from an ~1980s pick-up... installed many years ago as a weight-savings vs the original heavy cast-iron unit.... has been A-OK for me. I like to when I can learn from others' mistakes. I was told to just use the old Drum Drum Distribution Block and add an adjustable on the rear by an older friend who has done lots and lots of rear disk kits. To just make a cut with a tube cutter and splice one in. There is an episode of Roadkill Garage that David Freiburger and Steve Dulcich put a rear disk kit in a car. They spent all the evening and into the night fighting the proportioning valve that came with the kit. The next day put the old Distribution Block back in with a screw-type adjustable valve spliced into the rear brake line in no time at all. they tossed the new that never worked right proportioning valve in the trash can and said they would never ever do it any other way.
Last edited by 340SIX; 07/08/21 05:24 PM.
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: Mopar Mitch]
#2941465
07/09/21 10:31 AM
07/09/21 10:31 AM
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Joined: Jan 2003
Posts: 18,427 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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Nitroism -- the valve on my car is original... and there are similar others that also have the two wires. This wire does not attach to this valve. Unplug it and you will see it is not a switch. Grounding it will cause the light to be on. It most likely went to another valve depending on the application. Right now it ison the end of the valves spool. Like I said unplug it and look.
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Re: PROPORTIONING VALVE -- 4-WHEEL DISCS
[Re: NITROUSN]
#2941657
07/09/21 08:42 PM
07/09/21 08:42 PM
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Joined: Jan 2003
Posts: 15,526 Omaha Ne
TJP
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Nitroism -- the valve on my car is original... and there are similar others that also have the two wires. This wire does not attach to this valve. Unplug it and you will see it is not a switch. Grounding it will cause the light to be on. It most likely went to another valve depending on the application. Right now it ison the end of the valves spool. Like I said unplug it and look. Might be worthwhile to trace both wires to see where the wrong one should go. A schematic may help as well OR Maybe it's a developmental Hemi ABS valve, Extremely rare.
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