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Converting to dual master cyl
https://slantsix.org/forum/viewtopic.php?t=26890		 Page 1 of 1
Author:  daddanjer [ Mon Jan 28, 2008 1:08 pm ]
Post subject:  Converting to dual master cyl
Hello everyone, My son and I are restoring a 1966 Dart Gt. It has 9" drums all around. We have replaced all wheel cyl, hardware, had drums turned and new pads. We now would like to replace single res with dual. This is my first Mopar build and would like to ask if anyone could tell me which parts I will need to do this. Can I purchase a dual master from say Napa? I ask this because I'm not sure which will fit, i.e. rod and fittings. Do I need to replace valves under car? Sorry if these are simple questions but I want to make sure I provide the best safety while retaining most of the original parts. We are on a tight budget and at this point I can't afford to convert to disks. Thank you, Ed & Jeremy
Author:  polara pat [ Mon Jan 28, 2008 2:06 pm ]
Post subject: 
This is a good conversion to do and really isn't that hard. Here's my method, others may go about it differently but this has worked well for the conversions that I've done. The master can come from any supplier and they should be able to cross reference for you a later model with 9" brake vehicle that has a dual res. master. Be sure and specify power assist or manual. Your four way splitter sits right below the master and for the front circuit all you have to do is put a plug where the rear line enters. The original line from your single pot now threads into the hole marked front. (usually the one closest to the firewall) For the rear line attach a union and a pre-flared line with appropriate fittings on each end. Get it a little longer than necessary so you don't risk kinking the line. That's it, don't forget to bench bleed the new master and bleeding the whole circuit, starting at the passenger rear and moving forward is a good idea to not only purge all the air out but also flush out some of the old fluid.

Good luck.
Author:  daddanjer [ Mon Jan 28, 2008 2:17 pm ]
Post subject: 
Hi Pat, Thank you so much for your response. It sounds really easy. Thank you for the detailed info. Take care, Ed & Jeremy :D
Author:  volaredon [ Mon Jan 28, 2008 5:01 pm ]
Post subject: 
*BRAIN FART* I know that you would need it in a disc conversion but wouldn't there be a need to add a proportioning valve in there as well, between front/back even if he retained the drums? (Its been a while since i messed with a 4 wheel drum equipped car) Yes the dual master would be better than a single pot any day of the week.
Author:  emsvitil [ Mon Jan 28, 2008 5:32 pm ]
Post subject: 
No need to add the proportioning valve to a 4 wheel drum system (wasn't there to begin with, and you're not changing the pressure distribution with a dual master if it has the same diameter as the single master)
Author:  volaredon [ Mon Jan 28, 2008 5:35 pm ]
Post subject: 
Thought so, thought I'd bring it up though to be sure; likeI said it's been a while.
Author:  daddanjer [ Mon Jan 28, 2008 5:42 pm ]
Post subject: 
Hi everyone, Thanks for covering all the bases for us. Much appreciated. Ed & Jeremy
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