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Jul 21st, 2025 | | | | Joined: Sep 2006 Posts: 1,972 Big Bolt Forum Co-moderator | | Big Bolt Forum Co-moderator Joined: Sep 2006 Posts: 1,972 | I see there is a lot of information on converting to disc brakes on the Big Bolts. Has anyone just done a dual master cylinder with a booster on it? I got some info from RDomeck on his disc set up saying he used a 1990s master cylinder from a one ton and a booster from a 3/4 ton.
If anyone has done this before, do you have any pictures and descriptions on how you were able to use the stock brake pedal to actuated the booster. Looking at parts on line it looks that the diameter of the boosters are about 11 1/2". Never have worked with a conversion like this, so if anyone has suggestions please feel free to chime in.
A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton | | | | | Joined: Nov 2010 Posts: 430 'Bolter | | 'Bolter Joined: Nov 2010 Posts: 430 | Try this photo http://s1006.photobucket.com/user/r...228_zpsdc5840e2.jpg.html?sort=3&o=19You can see other in the link that show how I made the bracket. The rod going to the bell crank id really tight on the fill cap for the master. I ended up machining some fittings that went in place of the reservoir and went into hoses so I could mount a reservoir on the fire wall. I think I used a few of these http://www.mcmaster.com/#1169k21/=11ffi6u and made little bracket to hold them. Good luck with your search and hopefully someone can chime in on this as an option.
Last edited by RDomeck; 03/07/2016 3:12 AM.
| | | | | Joined: Jan 2005 Posts: 164 Shop Shark | | Shop Shark Joined: Jan 2005 Posts: 164 | I've wondered about this myself. Everyone keeps saying you need to go to disc brakes. But the 2-ton I'm looking at upgrading will never carry the loads it was designed for. If I don't plan on hitting a huge GVW, wouldn't the factory brakes with a modern booster be more than adequate, even at highway speeds?
| | | | | Joined: Oct 2007 Posts: 91 'Bolter | | 'Bolter Joined: Oct 2007 Posts: 91 | Canyonag77, your right, your stock brake system was engineered to stop your truck fully loaded, why risk your life redesigning it. Large modern trucks mostly all have drum brakes and they all stop just fine. Now if you modify your truck to do speeds it wasn't designed to do, then you might as well have a go at disc brakes too. Just my opinion ha ha. Super55 a dual master for the stock brake system would be a nice safety feature, please keep us informed if you figure this out.
Last edited by justmike; 03/27/2016 3:48 AM.
| | | | | Joined: Sep 2006 Posts: 1,972 Big Bolt Forum Co-moderator | | Big Bolt Forum Co-moderator Joined: Sep 2006 Posts: 1,972 | Still thinking about it. I have been reading up on some brake systems. I am not too worried about a single master cylinder, but if I can have a dual system that is a simple retro fit, I will certainly do it. I actually had both lines on my 2002 Dakota go at the same time. First two lines of the MC were rubbing together and they were rusty, and blew at the SAME TIME. Good thing I was on my property in low 4 wheel. If I was coming to a stop in traffic I might have gotten a bump on my head.
A day without laughter is a day wasted- Charlie Chaplin
When wrestling a grizzly bear, you have to keep at it until the bear gets tired, not when you get tired. 1948 Chevy 2-Ton | | | | | Joined: Aug 2005 Posts: 71 'Bolter | | 'Bolter Joined: Aug 2005 Posts: 71 | Hi Super55 ,I found a 1"1/4 bore MC this is the one I used on my 1948 2 ton
http://www.rockauto.com/en/moreinfo.php?pk=309636&cc=1052086&jsn=567&jsn=567
http://www.ebay.com/itm/Raybestos-MC39324-New-Master-Brake-Cylinder-/111878603876?hash=item1a0c7c0464:m:mRyd-vVY1EaAV0w2SkkAt2A&vxp=mtr
1"1/4 bore is the same as the original MC so it works well with stock brakes .
with a 8" dual diaphragm booster ,Pirate Jacks in NC is where I found one http://piratejack.net/ .The only problem I have is it runs out of vacuum so it needs a vacuum tank and check valve put on it .1st hit on the brakes it's great then it gets hard .You can find a tank on a truck with air brakes or older school buses that had juice brakes . I have a least 6,000 miles on on my conversion .Mine is still mounted under the floor .PM me your phone # and I can give you more details . Paul
Dorman has the same http://www.ebay.com/itm/Dorman-M39324-New-Master-Brake-Cylinder-/152032000320?hash=item2365d03940:m:mXT3BXtl87kjUMulJGbm2tA&vxp=mtr
Last edited by PAUL NOLZ; 03/31/2016 1:44 PM.
1948 Chevy 2 ton flatbed ex fire truck , and various motorcycles .
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