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Andy F modern MC adapter in A-body #1476265 07/29/13 11:41 PM 07/29/13 11:41 PM
Joined: Jan 2003 Posts: 8,180 Detroit, MI CokeBottleKid OP master
CokeBottleKid OP master Joined: Jan 2003 Posts: 8,180 Detroit, MI	So I have an A-body with factory manual brakes, I've done the conversion on other cars but always been power. What master cylinder do I need to get with the adapter? Looking for one with a 15/16 bore. Also is an adjustable rod necessary or not?

Re: Andy F modern MC adapter in A-body [Re: CokeBottleKid] #1476266 07/30/13 12:25 AM 07/30/13 12:25 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	An '89 Dakota has a 15/16" bore alum M/C but I do not know if it has the recess inside the rear piston recess "thimble" which is REQUIRED for a manual brake app. An alum M/C has either a thinner flange or the piston is closer to the flange (#2 iirc) which will want a shorter pushrod but the adapter moves the whole shebang forward which makes up for some (or all) of that distance. With the right (with the recess) M/C I would mock it up & go from there. There are several lengths of OE manual brake pushrods available live every 24 hour block of time like it's your last day on earth

Re: Andy F modern MC adapter in A-body [Re: CokeBottleKid] #1476267 07/30/13 12:51 AM 07/30/13 12:51 AM
Joined: Dec 2010 Posts: 12,375 SoCal MuuMuu101 I got lucky at Woodward!
MuuMuu101 I got lucky at Woodward! Joined: Dec 2010 Posts: 12,375 SoCal	Dr Diff sells the MC and adapter as a whole (kit). I'm not sure if a manual pushrod works; however, I bought an adjustable one from him for myself. I'm in the process of doing this swap. Just need to repair my firewall.

Re: Andy F modern MC adapter in A-body [Re: MuuMuu101] #1476268 07/30/13 07:14 AM 07/30/13 07:14 AM
Joined: Jan 2003 Posts: 305 East Tennessee B Burkenator enthusiast
Burkenator enthusiast B Joined: Jan 2003 Posts: 305 East Tennessee	My Dr. Diff kit worked great with my original manual pushrod. Did not even need to adjust to make my brake lights work correctly.

Re: Andy F modern MC adapter in A-body [Re: CokeBottleKid] #1476269 07/30/13 11:59 AM 07/30/13 11:59 AM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	Unfortunately, no off-the-shelf, 15/16" bore aluminum master cylinder will fit a manual brake application. As far as I know, I'm the only source for the master. I'm currently out, but the machine shop is working on another batch. Contact info

Re: Andy F modern MC adapter in A-body [Re: Burkenator] #1476270 07/30/13 12:00 PM 07/30/13 12:00 PM
Joined: Jan 2003 Posts: 31,050 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,050 Oregon	Quote: My Dr. Diff kit worked great with my original manual pushrod. Did not even need to adjust to make my brake lights work correctly. That is the way it is designed to work!

Re: Andy F modern MC adapter in A-body [Re: DoctorDiff] #1476271 07/30/13 12:49 PM 07/30/13 12:49 PM
Joined: Jan 2003 Posts: 8,180 Detroit, MI CokeBottleKid OP master
CokeBottleKid OP master Joined: Jan 2003 Posts: 8,180 Detroit, MI	Quote: Unfortunately, no off-the-shelf, 15/16" bore aluminum master cylinder will fit a manual brake application. As far as I know, I'm the only source for the master. I'm currently out, but the machine shop is working on another batch. How come on your website it states for B/E only?

Re: Andy F modern MC adapter in A-body [Re: CokeBottleKid] #1476272 07/30/13 01:23 PM 07/30/13 01:23 PM
Joined: Sep 2007 Posts: 14,889 up yours Supercuda About to go away
Supercuda About to go away Joined: Sep 2007 Posts: 14,889 up yours	On this note, why not just run a 15/16" four bolt M/C? Other than the slight weight savings I don't see the benefit of the 2 bolt setup. I did check out Rock Auto to price a 4 bolt unit, about $30 for a new Raybestos Professional one. 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.

Re: Andy F modern MC adapter in A-body [Re: CokeBottleKid] #1476273 07/31/13 02:11 AM 07/31/13 02:11 AM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	As far as I know, my website lists A, B, and E body applications: * 4 Hole for all A-Bodies and B/E-Bodies w/power brakes * 4 Stud for B/E Bodies w/manual brakes Contact info

Re: Andy F modern MC adapter in A-body [Re: DoctorDiff] #1476274 08/01/13 01:11 AM 08/01/13 01:11 AM
Joined: Jan 2003 Posts: 8,180 Detroit, MI CokeBottleKid OP master
CokeBottleKid OP master Joined: Jan 2003 Posts: 8,180 Detroit, MI	Quote: As far as I know, my website lists A, B, and E body applications: * 4 Hole for all A-Bodies and B/E-Bodies w/power brakes * 4 Stud for B/E Bodies w/manual brakes Exactly, why no 4 stud for A-body with manual brakes... why is it different than B or E?

Re: Andy F modern MC adapter in A-body [Re: CokeBottleKid] #1476275 08/01/13 03:20 AM 08/01/13 03:20 AM
Joined: Jan 2003 Posts: 8,016 Polson, MT DoctorDiff master
DoctorDiff master Joined: Jan 2003 Posts: 8,016 Polson, MT	A 4 stud adapter does not fit manual brake equipped A-bodies because the studs are mounted in the firewall. Contact info

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