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 Post subject: dual calipers
PostPosted: Thu Feb 18, 2010 12:31 pm 
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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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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 1:15 pm 
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Awsome! What did you do as far as a master cylinder? Gonna take a bigger bore to move that much fluid.

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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 2:33 pm 
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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.

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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 4:17 pm 
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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.

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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 6:19 pm 
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Bug glad you got them bled out did it help bleeding the cutter brake?

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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 6:21 pm 
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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.

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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 8:37 pm 
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looks great bug! were did you split your lines?

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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 9:14 pm 
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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.

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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 10:31 pm 
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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!


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 Post subject: Re: dual calipers
PostPosted: Thu Feb 18, 2010 10:50 pm 
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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

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 Post subject: Re: dual calipers
PostPosted: Fri Feb 19, 2010 9:34 am 
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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)


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 Post subject: Re: dual calipers
PostPosted: Fri Feb 19, 2010 10:07 am 
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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.

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 Post subject: Re: dual calipers
PostPosted: Sat Feb 20, 2010 9:52 am 
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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.

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 Post subject: Re: dual calipers
PostPosted: Sat Feb 20, 2010 7:35 pm 
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got to try them out today and for the first time with the boggers I have good turning brakes.

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 Post subject: Re: dual calipers
PostPosted: Sat Feb 20, 2010 10:32 pm 
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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

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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 2:42 pm 
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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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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 3:30 pm 
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Why didn't you just fit a smaller master cylinder?? :?:


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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 3:48 pm 
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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 . :?

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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 4:02 pm 
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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?

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Image

Atta boy! That makes me feel better, does it you? :mrgreen:


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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 4:12 pm 
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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:


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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 7:03 pm 
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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.


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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 7:30 pm 
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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:

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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 7:33 pm 
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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)


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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 8:42 pm 
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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.

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 Post subject: Re: dual calipers
PostPosted: Thu Mar 25, 2010 9:03 pm 
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All that stuff is way over my head. But I got the best turning brakes I have ever had. :?

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