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dual calipers
http://woodsbuggy.com/phpBB3/viewtopic.php?f=10&t=8777		 Page 1 of 2
Author:  Firebug [ Thu Feb 18, 2010 12:31 pm ]
Post subject:  dual calipers
Some of us with big tires and long wheel base can benefit from dual calipers. I finally got mine installed and bled. Now I have normal turning brakes,,,,I hope :oops:

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Author:  Odyknuck [ Thu Feb 18, 2010 1:15 pm ]
Post subject:  Re: dual calipers
Awsome! What did you do as far as a master cylinder? Gonna take a bigger bore to move that much fluid.
Author:  Rick [ Thu Feb 18, 2010 2:33 pm ]
Post subject:  Re: dual calipers
thats cool, i had a buddy do that on his buggy when he went w/c. but he used the baby calipers, those wilwoods sould woo them boggers.
Author:  Firebug [ Thu Feb 18, 2010 4:17 pm ]
Post subject:  Re: dual calipers
Odyknuck wrote:
Awsome! What did you do as far as a master cylinder? Gonna take a bigger bore to move that much fluid.

So far the stock single piston bug master seems to be fine. I use a residual valve to minimize travel on the pistons, braided lines where flexibility is needed. Took a while to bleed but it seems fine. Maybe a little more travel needed in the pedal and cutters.
Author:  pipedope [ Thu Feb 18, 2010 6:19 pm ]
Post subject:  Re: dual calipers
Bug glad you got them bled out did it help bleeding the cutter brake?
Author:  Firebug [ Thu Feb 18, 2010 6:21 pm ]
Post subject:  Re: dual calipers
pipedope wrote:
Bug glad you got them bled out did it help bleeding the cutter brake?

the way I have mine mounted the bleeder is low , so no but it has a hard pedal now. I think I will keep them now.
Author:  bmoore [ Thu Feb 18, 2010 8:37 pm ]
Post subject:  Re: dual calipers
looks great bug! were did you split your lines?
Author:  Firebug [ Thu Feb 18, 2010 9:14 pm ]
Post subject:  Re: dual calipers
bmoore wrote:
looks great bug! were did you split your lines?

the pic is fuzzy and there is a shop light in the back ground right where they meet to a brass T I took off of a bug torsion.
Author:  kybuggy1 [ Thu Feb 18, 2010 10:31 pm ]
Post subject:  Re: dual calipers
Glad to hear you got 'em to workin better. Now you'll be ready for them D&K hills :wink: !

Got you a chainguard? Looks like them chains are just waiting to eat up them purdy braided lines!
Author:  Firebug [ Thu Feb 18, 2010 10:50 pm ]
Post subject:  Re: dual calipers
kybuggy1 wrote:
Glad to hear you got 'em to workin better. Now you'll be ready for them D&K hills :wink: !

Got you a chainguard? Looks like them chains are just waiting to eat up them purdy braided lines!



I will think about that ,,,chain guards,,,maybe steal some off a bicycle
Author:  kybuggy1 [ Fri Feb 19, 2010 9:34 am ]
Post subject:  Re: dual calipers
whatever it takes :wink:
I remember this one dude that broke bolts out his sprocket..........brakes went bye bye and he needed this other guy to bring him a line............ 8)
Author:  pipedope [ Fri Feb 19, 2010 10:07 am ]
Post subject:  Re: dual calipers
there use to be a bunch of guy's run 280z axles with no guards and they would brake and also brake there brake lines.1 guy broke his and never made it back it killed him he rolled back wards off a hill down at rush or lewis county ky cant remmember which 1 it was but bug you might want to do what larry said.
Author:  Odyknuck [ Sat Feb 20, 2010 9:52 am ]
Post subject:  Re: dual calipers
Broken brake lines is why I like having seperate Masters for the front and rear. If one brakes you still have the other set to stop ya. I only have one on mine right now and I will be changing it over this winter.
Author:  Firebug [ Sat Feb 20, 2010 7:35 pm ]
Post subject:  Re: dual calipers
got to try them out today and for the first time with the boggers I have good turning brakes.
Author:  bmoore [ Sat Feb 20, 2010 10:32 pm ]
Post subject:  Re: dual calipers
Firebug wrote:
got to try them out today and for the first time with the boggers I have good turning brakes.


glad to hear they work,look forward to seeing them in person,maybe i can steel some ideas! LOL
Author:  Firebug [ Thu Mar 25, 2010 2:42 pm ]
Post subject:  Re: dual calipers
kybuggy1 wrote:
whatever it takes :wink:
I remember this one dude that broke bolts out his sprocket..........brakes went bye bye and he needed this other guy to bring him a line............ 8)

took your advice,,,will this work?

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Author:  PhillipM [ Thu Mar 25, 2010 3:30 pm ]
Post subject:  Re: dual calipers
Why didn't you just fit a smaller master cylinder?? :?:
Author:  Firebug [ Thu Mar 25, 2010 3:48 pm ]
Post subject:  Re: dual calipers
PhillipM wrote:
Why didn't you just fit a smaller master cylinder?? :?:


I did not know that a smaller master cylinder would give me more braking power . :?
Author:  kybuggy1 [ Thu Mar 25, 2010 4:02 pm ]
Post subject:  Re: dual calipers
Firebug wrote:
kybuggy1 wrote:
whatever it takes :wink:
I remember this one dude that broke bolts out his sprocket..........brakes went bye bye and he needed this other guy to bring him a line............ 8)

took your advice,,,will this work?

Image

Image

Atta boy! That makes me feel better, does it you? :mrgreen:
Author:  kybuggy1 [ Thu Mar 25, 2010 4:12 pm ]
Post subject:  Re: dual calipers
PhillipM wrote:
Why didn't you just fit a smaller master cylinder?? :?:



A smaller master would give more travel in the foot pedal and a spongier feel, not desired. What he did need was the ability to stop heavy tires (with a stong running chaindrive reduced 6 cylinder pullin on them) instantly with a cutter brake to cut in and out of trees while hillclimbing with his gas pedal on the mat. It worked out well. :wink:
Author:  PhillipM [ Thu Mar 25, 2010 7:03 pm ]
Post subject:  Re: dual calipers
kybuggy1 wrote:
PhillipM wrote:
Why didn't you just fit a smaller master cylinder?? :?:



A smaller master would give more travel in the foot pedal and a spongier feel, not desired. What he did need was the ability to stop heavy tires (with a stong running chaindrive reduced 6 cylinder pullin on them) instantly with a cutter brake to cut in and out of trees while hillclimbing with his gas pedal on the mat. It worked out well. :wink:



Wait, if both those calipers are hooked up to the footbrake then that's exactly what he's done, just the heavy way that's a bit of a pain in the arse :D

Travel is a functional ratio of master cylinder area to caliper piston area, as is force, as the travel results from knockoff in the caliper, pad compressability, brake line flex, caliper body flex and the compressability of the systems seals.
If anything, introducing more seals + double the knockoff + slack will have made it worse than just switching to a smaller M/C or bigger piston caliper.


Hope I'm not pissing on your bonfire!
Author:  gasman [ Thu Mar 25, 2010 7:30 pm ]
Post subject:  Re: dual calipers
i may be wrong to but i believe that the smaller like say a 3/4 bore m/c does give you more pressure than a 7/8 or 1 inch bore and that the larger bores have less pressure but move more volume of fluid.so what i think phillip is saying is correct,but now with two calipers you would have to run the larger bore to feed both of them or the smaller m/c would have a long way to travel to transfer that much fluid.of course im a dumb ass about half the time and a smart ass the other half lol so i may be wrong.lmao.chad :mrgreen:
Author:  PhillipM [ Thu Mar 25, 2010 7:33 pm ]
Post subject:  Re: dual calipers
gasman wrote:
i may be wrong to but i believe that the smaller like say a 3/4 bore m/c does give you more pressure than a 7/8 or 1 inch bore and that the larger bores have less pressure but move more volume of fluid.so what i think phillip is saying is correct,but now with two calipers you would have to run the larger bore to feed both of them or the smaller m/c would have a long way to travel to transfer that much fluid.of course im a dumb ass about half the time and a smart ass the other half lol so i may be wrong.lmao.chad :mrgreen:


That's exactly it.

Switching from a 7/8ths cylinder to a 5/8ths would give you almost double the pressure (1.9x as much) and hence braking power, but flow a similar amount less fluid per inch of travel, (although the travel wouldn't actually double, as you've still got the same amount of travel in the play in linkages + dead spot of the master cylinder for closing the fluid transfer ports)
Author:  nitro_mudder [ Thu Mar 25, 2010 8:42 pm ]
Post subject:  Re: dual calipers
Phil is right, just think of it as a lever. When you change the the sizes it's like moving the fulcrum. Larger Master means less leverage but a shorter stroke. like moving the fulcrum closer towards you.
Author:  Firebug [ Thu Mar 25, 2010 9:03 pm ]
Post subject:  Re: dual calipers
All that stuff is way over my head. But I got the best turning brakes I have ever had. :?
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