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swappings disc's on a 66 "B",keep original master cyl ? #376164 07/15/09 01:07 PM 07/15/09 01:07 PM
Joined: Oct 2003 Posts: 1,804 BC Canada O ogopogo OP top fuel
ogopogo OP top fuel O Joined: Oct 2003 Posts: 1,804 BC Canada	I am switching my original manual drum equipped 66 plymouth to 11" disc brakes and I would prefer to keep the stock single reservoir master cylinder so the car keeps a stock appearance.Is there any reason I cant use the single res master cylinder?I just re -read the mopar action swap article and it does say I either need a super rare 66 only disc brake master or switch to a dual reservoir master cylinder,any one know for sure what I need to do? thanks!

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: ogopogo] #376165 07/15/09 01:26 PM 07/15/09 01:26 PM
Joined: Jan 2003 Posts: 2,530 Nunya CA CR8CRSHR master
CR8CRSHR master Joined: Jan 2003 Posts: 2,530 Nunya CA	Do not use the single M/C with disc brakes regardless of your wanting to keep it original. The single M/C is designed for drum brakes only. The dual M/C is designed for both drum and disc but you will need the disc M/C and a proportioning valve to effectively make the system work. Unless this is a complete resto and you are keeping the drum brakes, I would avoid the single M/C at all costs. It isn't worth the "correct look" when it comes to safety. And that is what this is really all about...Isn't It????

Re: swappings disc's on a 66 "B",keep original master c [Re: CR8CRSHR] #376166 07/15/09 01:30 PM 07/15/09 01:30 PM
Joined: Sep 2005 Posts: 6,516 Santa Cruz, California L Lefty master
Lefty master L Joined: Sep 2005 Posts: 6,516 Santa Cruz, California	Quote: I would avoid the single M/C at all costs. Any leak at all and you have no brakes - too dangerous a risk to look "correct".

Re: swappings disc's on a 66 "B",keep original master c [Re: Lefty] #376167 07/15/09 03:09 PM 07/15/09 03:09 PM
Joined: Jan 2003 Posts: 75,326 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,326 A gulag near you.	Maybe it's a trailer poodle and the only safety is worrying about running someone over while it's being pushed on and off the trailer ???

Re: swappings disc's on a 66 "B",keep original master c [Re: JohnRR] #376168 07/15/09 04:08 PM 07/15/09 04:08 PM
Joined: Jan 2003 Posts: 2,530 Nunya CA CR8CRSHR master
CR8CRSHR master Joined: Jan 2003 Posts: 2,530 Nunya CA	Too Much....I never thought of that. Are not these cars to be driven????

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: ogopogo] #376169 07/15/09 04:10 PM 07/15/09 04:10 PM
Joined: May 2009 Posts: 18 California B brake tech 73 member
brake tech 73 member B Joined: May 2009 Posts: 18 California	You really don't want to use a single master cylinder , for a number of reasons, and saftey is a big one! you are also going to remove the residual pressure valve, as the drum brake rpv will cause the disc brakes to drag. Wilwood has a very nice die cast master cylinder that is available in different bore sizes to suit your application, depending on weather or not you have power , or manual brakes.

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: brake tech 73] #376170 07/15/09 04:26 PM 07/15/09 04:26 PM
Joined: Oct 2003 Posts: 1,804 BC Canada O ogopogo OP top fuel
ogopogo OP top fuel O Joined: Oct 2003 Posts: 1,804 BC Canada	Quote: Maybe it's a trailer poodle and the only safety is worrying about running someone over while it's being pushed on and off the trailer ??? No show poodle ,thats for sure.I want it to look stock at a glance as it is a factory hemi car,however I am installing a 630hp stroker hemi, firm feel steering,bigger T bars etc because it is going to be a fun driver.I am going to install a 1972 disc master cylinder and combo valve that I have here and remove the single reservoir stuff for now,thanks for the replies!

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: ogopogo] #376171 07/15/09 04:53 PM 07/15/09 04:53 PM
Joined: Jan 2003 Posts: 21,129 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,129 Niles , Ohio	99% of the people wont know 67 was the first year for dual master anyway.Like said ditch the single master.I know unless its a 100 point car they want you to change the master to dual anyway.Kind of like the 30s Fords.They allow the drivers to go hyd instead on mechanical.Rocky Chrysler Firepower

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: ogopogo] #376172 07/15/09 05:47 PM 07/15/09 05:47 PM
Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada R RUNCHARGER I Live Here
RUNCHARGER I Live Here R Joined: Jan 2003 Posts: 15,976 Chilliwack B.C. Canada	I'm not sure the single would have enough fluid capacity to work with the discs anyway. Might as well ditch it and run the dual. Sheldon

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: ogopogo] #376173 07/15/09 06:45 PM 07/15/09 06:45 PM
Joined: Nov 2004 Posts: 5,118 Alone in the darkness gamagoat6x6 super street
gamagoat6x6 super street Joined: Nov 2004 Posts: 5,118 Alone in the darkness	I drove for decades with single line systems and never had a brake failure so I don`t have a big issue using them now and both my cars had `em before I sold them with no troubles. The `66 is a unique system with a the above mentioned one year only master and a special residual pressure valve in the line to the rears. This special master not only has much more capacity but it also has a bigger bore. Running with the small capacity of a drum master really would be dangerous. PM if interested. `02 RAM2500 SPORT V10 4x4 `06 GMC sierra NO cars

Re: swappings disc's on a 66 "B",keep original master c [Re: CR8CRSHR] #376174 07/15/09 07:05 PM 07/15/09 07:05 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	w/ rocky. Most people at a glance are not going to know that dual isn't a stock reservoir on your car. And even if someone does realize it, so what, it's a safety upgrade that looks very very stockish. Quote: Too Much....I never thought of that. Are not these cars to be driven???? Hey there are people with show cars who're running original or NOS tires! You can tell those cars never see above 10mph.

Re: swappings disc's on a 66 "B",keep original master c [Re: DaytonaTurbo] #376175 07/15/09 08:15 PM 07/15/09 08:15 PM
Joined: Sep 2005 Posts: 6,516 Santa Cruz, California L Lefty master
Lefty master L Joined: Sep 2005 Posts: 6,516 Santa Cruz, California	Quote: Hey there are people with show cars who're running original or NOS tires! You can tell those cars never see above 10mph. Yeah, but are they running "vintage" air? I heard the good judges can tell...

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: gamagoat6x6] #376176 07/15/09 11:07 PM 07/15/09 11:07 PM
Joined: Jan 2003 Posts: 75,326 A gulag near you. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,326 A gulag near you.	Quote: I drove for decades with single line systems and never had a brake failure so I don`t have a big issue using them now and both my cars had `em before I sold them with no troubles. The `66 is a unique system with a the above mentioned one year only master and a special residual pressure valve in the line to the rears. This special master not only has much more capacity but it also has a bigger bore. Running with the small capacity of a drum master really would be dangerous. PM if interested. There's always one in the crowd , I bet you're the kid my mom talked about , you know the one jumping off the bridge ...

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: JohnRR] #376177 07/15/09 11:34 PM 07/15/09 11:34 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	I'm with Gamagoat, I am not afraid of the single system, if it's good(& freshly went thru) it's good (but I want a functioning E brake ) and if that M/C in the pic has enough capacity for your planned disc/drums use it & put a 10lb RPV in the line to the drums. Without a prop valve things wont be totally perfect but I dont think this is a daily driver. live every 24 hour block of time like it's your last day on earth

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: RapidRobert] #376178 07/16/09 12:34 PM 07/16/09 12:34 PM
Joined: Jan 2003 Posts: 2,530 Nunya CA CR8CRSHR master
CR8CRSHR master Joined: Jan 2003 Posts: 2,530 Nunya CA	Sorry but the main fact is that a single pot M/C will not...and I repeat...will not be sufficient for disc brakes.....Period. I don't know where some get their theories from on this subject but obviously there are those that cannot nor will not utilize safety when it comes to 40 plus year old technology. Go ahead and run your single M/C and drum brakes if you so choose. For me the upgrade is a no brainer and I will always get rid of correct form in favor of safe function...

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: CR8CRSHR] #376179 07/16/09 01:31 PM 07/16/09 01:31 PM
Joined: Mar 2009 Posts: 73 Phoenix Arizona thebankerstoy member
thebankerstoy member Joined: Mar 2009 Posts: 73 Phoenix Arizona	This gentleman is also planning on running a "630 HP Hemi" and I can tell you that I would NOT want ANY single line master cylinder being responsible for safely stopping that combo! I also own a 1966 Coronet 500 big block car and it's only running a mildly modified 1969 440 and with the cars original stock single master cylinder and 10" power drum brakes, it was NOT easy getting the car slowed down on the drag strip by the first return road turn off, so I first converted the car to a 67 Coronet donor cars dual line set-up and when that wasn't enough, I then went to an aftermarket power disc brake conversion kit with 11" cross drilled and slotted rotors. When it comes to safety on a street and or strip car, being "factory correct" is REALLY low on my priority list...... Richard

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: thebankerstoy] #376180 07/16/09 02:30 PM 07/16/09 02:30 PM
Joined: Feb 2003 Posts: 1,095 Bloomington, Illernoise cptn60 super stock
cptn60 super stock Joined: Feb 2003 Posts: 1,095 Bloomington, Illernoise	Quote: This gentleman is also planning on running a "630 HP Hemi" and I can tell you that I would NOT want ANY single line master cylinder being responsible for safely stopping that combo! I also own a 1966 Coronet 500 big block car and it's only running a mildly modified 1969 440 and with the cars original stock single master cylinder and 10" power drum brakes, it was NOT easy getting the car slowed down on the drag strip by the first return road turn off, so I first converted the car to a 67 Coronet donor cars dual line set-up and when that wasn't enough, I then went to an aftermarket power disc brake conversion kit with 11" cross drilled and slotted rotors. When it comes to safety on a street and or strip car, being "factory correct" is REALLY low on my priority list...... Richard Try stopping a 66 Polara with no brakes(single reservoir). Been there, very scary stuff. This space available for rent

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: cptn60] #376181 07/16/09 06:01 PM 07/16/09 06:01 PM
Joined: Jan 2003 Posts: 21,129 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,129 Niles , Ohio	Ive had a few singles go out.Its not fun.That was when you drove cars with them.Try stopping a 65 New Yorker with one.Even the park brake dosent want to slow it.Rocky Chrysler Firepower

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: therocks] #376182 07/16/09 07:00 PM 07/16/09 07:00 PM
Joined: Jul 2004 Posts: 3,857 Arlington, Texas B bobby66 master
bobby66 master B Joined: Jul 2004 Posts: 3,857 Arlington, Texas	I think disc brakes were available in '66 with a single pot MC.

Re: swappings disc's on a 66 "B",keep original master cyl ? [Re: CR8CRSHR] #376183 07/16/09 07:45 PM 07/16/09 07:45 PM
Joined: Nov 2004 Posts: 5,118 Alone in the darkness gamagoat6x6 super street
gamagoat6x6 super street Joined: Nov 2004 Posts: 5,118 Alone in the darkness	Quote: Sorry but the main fact is that a single pot M/C will not...and I repeat...will not be sufficient for disc brakes.....Period. That`s odd. the master in the picture is original from a `66 monaco with the big four piston BUDD calipers and it has plenty of capacity. It worked like a charm on my heavy, 440 powered car for years. `02 RAM2500 SPORT V10 4x4 `06 GMC sierra NO cars

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