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11-08-2011, 02:01 AM | #1 |
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Join Date: May 2010
Location: Napier, New Zealand
Posts: 2,001
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Brake question...
Is a dual master cylinder with a 1" bore and about 1 1/4" stroke going to work with my 39 front brakes and 47 pickup rears?
Thanks, Marty. |
11-08-2011, 02:17 PM | #2 |
Senior Member
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Re: Brake question...
I would say it should .I used a MK 2 zepher on this set up once and it didnt because the bore size of the MC was 5/8 .So the displacment was not matched .You need at least the size of the stock 39 MC .
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11-08-2011, 07:46 PM | #3 |
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Join Date: May 2010
Location: La Verne CA
Posts: 432
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Re: Brake question...
The bore of the original 39 MC is 1-1/16", or 1/16" larger than the dual MC. This will work, but will require slightly more pedal travel to push same amount of fluid, but pedal will be a little easier to push. You do need to confirm that the pushrod stroke (resulting from full available pedal travel, including about 3/8" for free travel at pedal and 1/16" at pushrod) is equal to or exceeds the full stroke of the MC. See my recent other post regarding dual MC's. Also, IF the new MC has no built-in residual pressure valves, will need to use external 10lb valves as near to the MC as possible. I am aware of ONE MC # that has built-in valves for 4-whl drum brakes, but there may be others; someone may know...
You don't say what year/model your vehicle is, but space above the dual MC can be an issue/problem, as well as toward the rear of where the original MC was located... Need access for the typically larger "lid" so have to cut a bigger hole usually...
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11-08-2011, 09:10 PM | #4 |
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Re: Brake question...
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