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Master Cylinder

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toysprite

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Hi all, Got a question for you four wheel disk brake guys. I really don't wan't to do the double master cylinder thing. I would like to stick with a single tandem style if possible. I'm not sure if the original has the volume needed or not to work properly. This is what I have as far as brakes. I have Miata rotors and calipers up front and RX7 rotors and calipers in the rear. I have an adjustable prop valve and so far the original Master from the 68 Sprite. I have not routed any lines yet because of the master cylinder question. I would say I could just hook it up and try it but I don't want to try and rerout or fab anything once I get the engine back in. I know others have been through this and would like to learn from their trial and error.

Thanks for any thoughts or replies,
 
Abit of an aside, but what did it take to fit the miata rotors and calipers to the front? Do you have any of the fitment/clearance issues like the other big brake kits? Is there a significant difference in area of the caliper piston over the original spridget?

Are the rx7 rotors and calipers mounted to the original sprite rear?
 
I had all sorts of fitment issues with the Miata bits. My car was well on its way to the scrap pile before I got it. Everything on the front was shot. Buying all new parts was out of the question. So I got the Miata hubs knuckles and brakes and did some fabbing. I'm using 14" wheels now so everything fits. As far as the rear Axle. The original stuff was shot so now it has a narrowed RX7 axle with the disk brakes.The Engine needed a change too so I got something a bit more modern and a little more power so I needed a better axle anyway.
 
Volume of the MC can be calculated based on original dimensions of the MC and calipers, at least for the front. Going to disc in the rear can't be calculated so easily.
You must ensure to include the increased/decreased wheel torque due to larger wheels / larger discs.
Proportional valves are usually pressure limiters for the rear brakes. Excellent for preventing rear brake lockup while allowing good rear braking. But it doesn't really change the brake force distribution F/R except at maximum braking.
 
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