Master Cylinder question for the masses...

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da_bull

Well-known member
Joined
Sep 8, 2019
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47
I have built a frame using 2x3x3/16 tubing. I am at that point where I am trying to decide what kind of master cylinder to use and where to put it. Throughout the build, I was just thinking simple under the car, pedal arm all inclusive, frame mounted one like my 32 Ford had. My issue is that style is about 5.5"-6" tall. With the 3" frame (sitting on the ground with bags), 5/8" urethane CJ body mounts, 1" floor tubing and 1/2" plywood for the floor, only nets me 5-1/8" and I really dont want to have the master cylinder that close to the ground when the bags are deflated. So if I raise it up 1", I only have 4". That will basically put a ~2" bump in the floor. Not doing a booster. Any other ideas? Remote reservoir? Shorter cylinder? VERY small firewall mounted? Thanks in advance guys!
 

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How about one of those 90 degree units that goes inside the firewall under the dash

I've seen those. I could do that, but I'd have to remove the bottom of cowl gas tank. Can you get to the reservoir on those?
 
If you go with a remote reservoir you will still have the lines coming in the top, but with a 90* it could work.

Another idea is put the master cylinder farther to the back, and use a long pushrod.
 
If you go with a remote reservoir you will still have the lines coming in the top, but with a 90* it could work.

Another idea is put the master cylinder farther to the back, and use a long pushrod.

I'd though about doing the longer rod and putting it under my seat (wouldnt care about the bump there. Can you do that safely? Curious about flex in the rod. My pea-brain says maybe like a tie rod/panhard bar with clevis'd end and just a short section of the push rod at the cylinder.
 
You can safely run a long rod as long as you have support brackets along the way with a hole in each one to run the rod through to keep the rod from flexing.
The diameter of the rod and how hard the material is, is what determines how many brackets you will need.
 

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