3/4 vs 11/16 master cylinder.
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Road Warrior
Joined: Aug 2007
Posts: 1,564
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From: Oakdale Ca.
3/4 vs 11/16 master cylinder.
Which one would be better for dual disc? I have not seen too many 3/4 but it is what I have on my 91 PM controlls. I am contemplating doing the zx14 with dual brembo calipers. What size will work better.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
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From: Haslet Texas
The 3/4 will work better.
The bigger the bore the more fluid you push.
The more fluid you push the more pressure you get at the calliper.
The more pressure you get at the caliper the harder the caliper pushes the brake pads into the rotor.
The harder the caliper pushes the brake pads into the rotor the better you stop.
The bigger the bore the more fluid you push.
The more fluid you push the more pressure you get at the calliper.
The more pressure you get at the caliper the harder the caliper pushes the brake pads into the rotor.
The harder the caliper pushes the brake pads into the rotor the better you stop.
Seasoned HDF Member
Joined: Jul 2014
Posts: 8,607
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From: Cental, MI
The 3/4 will work better.
The bigger the bore the more fluid you push.
The more fluid you push the more pressure you get at the calliper.
The more pressure you get at the caliper the harder the caliper pushes the brake pads into the rotor.
The harder the caliper pushes the brake pads into the rotor the better you stop.
The bigger the bore the more fluid you push.
The more fluid you push the more pressure you get at the calliper.
The more pressure you get at the caliper the harder the caliper pushes the brake pads into the rotor.
The harder the caliper pushes the brake pads into the rotor the better you stop.
which means that the Smaller diameter... assuming Caliper Fill [I think we have that] will provide more mechanical Leverage... No More built in Anti-Lock!!
ie Less lever pressure applied, for more Braking action.
Looks like a Situation for Experimentation... Tell us the Result.
Last edited by Racepres; Jul 24, 2018 at 07:37 PM.
Dirt don't hurt
Joined: Jan 2011
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From: Haslet Texas
Following this logic then a 1/8th inch bore would be wonderful....good luck with that.
Banned
Joined: May 2018
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From: Viet Vet, crossroads
You would get a lot of pressure but not much volume.
It is not logical to argue with the numbers.
It is not logical to argue with the numbers.
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Dirt don't hurt
Joined: Jan 2011
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From: Haslet Texas
The simple fact is that a smaller bore MC will give you less pressure in the caliper using the same lever distance than a larger bore MC.
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Seasoned HDF Member
Joined: Jul 2014
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From: Cental, MI
Using numbers is how you figure out what you need to do the job you want to do (in this case how much pressure you need in the caliper to make the brake pads push against the rotor effectively).
The simple fact is that a smaller bore MC will give you less pressure in the caliper using the same lever distance than a larger bore MC.
The simple fact is that a smaller bore MC will give you less pressure in the caliper using the same lever distance than a larger bore MC.
The Distance traveled is a Good Argument... and of course, a Larger Cubic Inch will travel less to make the Given Volume..
Like I said tho... Larger Cubic inch [centimeters if you wish] require More Lever Pressure in order to Create the Same PSI [Pressure] on the Calipers...
So Yea... a 1/8" diameter MC can build Tremendous Pressure with a relatively small amount of Lever Pressure... But, If it is Not enough Volume to move the "Puck" the Required Distance... it ain't gonna Make any... Nothing to Push against...
Fill and Move the Caliper/Puck first... apply PSI second..
Matched system should put the Lever near the End of it's Travel at Lock-up...
Last edited by Racepres; Jul 25, 2018 at 06:57 AM.
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
Likes: 4,561
From: Haslet Texas
You guys are arguing with yourselves.. ie Both correct... but, not talking the same language..
The Distance traveled is a Good Argument... and of course, a Larger Cubic Inch will travel less to make the Given Volume..
Like I said tho... Larger Cubic inch [centimeters if you wish] require More Lever Pressure in order to Create the Same PSI [Pressure] on the Calipers...
So Yea... a 1/8" diameter MC can build Tremendous Pressure with a relatively small amount of Lever Pressure... But, If it is Not enough Volume to move the "Puck" the Required Distance... it ain't gonna Make any... Nothing to Push against...
Fill and Move the Caliper/Puck first... apply PSI second..
Matched system should put the Lever near the End of it's Travel at Lock-up...
The Distance traveled is a Good Argument... and of course, a Larger Cubic Inch will travel less to make the Given Volume..
Like I said tho... Larger Cubic inch [centimeters if you wish] require More Lever Pressure in order to Create the Same PSI [Pressure] on the Calipers...
So Yea... a 1/8" diameter MC can build Tremendous Pressure with a relatively small amount of Lever Pressure... But, If it is Not enough Volume to move the "Puck" the Required Distance... it ain't gonna Make any... Nothing to Push against...
Fill and Move the Caliper/Puck first... apply PSI second..
Matched system should put the Lever near the End of it's Travel at Lock-up...
Y'all can say what y'all want but a smaller MC will produce less braking force than a larger one.
And that is what the subject of this discussion is about...