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Discussion Starter · #1 ·
I am building a new rear D44 for my Scrambler and need to know what dimension hard brake line to use from the wheel cylinders to the T-block, 1/4, 5/16th, etc. Does it make a difference? The CJ currently is manual brakes but I hope to make it power in the near future.

Thanks for your help.
 

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[ QUOTE ]
I am building a new rear D44 for my Scrambler and need to know what dimension hard brake line to use from the wheel cylinders to the T-block, 1/4, 5/16th, etc. Does it make a difference? The CJ currently is manual brakes but I hope to make it power in the near future.

Thanks for your help.

[/ QUOTE ]

Does the hydraulic size make a difference? Yes, and no, it depends on which side of the line you're on. Remember, an OEM Hydraulic brake line does change, and gets smaller as it terminates at the OEM AMC20. There is a line resistance as the brake fluid is pushed through a smaller line. However, that resistance is not noticed as you'd depress the brake pedal. Using larger lines eliminate that resistance, but with no real noticed effect. All it really does is make you use more brake fluid, and have a larger target for debris to hit on the axle.

IMHO, there is a benefit of using ONE size of brake line going from the Master Cylinder to all four wheels. That benefit is you need only carry one section of brake line to do a field repair, rather than many sizes.

I find these links full of value:

http://www.dimebank.com/BrakePlumbing.html

http://www.bikernet.com/events/PageViewer.asp?PageID=328

http://www.classictrucks.com/tech/0501cl_brake_line_basics/
 

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Discussion Starter · #3 ·
Leve,

What is the OEM size brake line to the AMC 20 as that is what I am replacing. If I use the same size tube then the rest of the braking system would remain within factory tolerances right?
 

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Not disagreeing with Leve (I know better):
Most hard lines to rear drums are 1/4"
Most hard lines to front drums or disc are 3/16"

Another site to add to those Leve mentioned

www.mpbrakes.com
Mostly for hot rod builders but lots of good info.

Rockin On
 
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