Upgrading Front Brake Lines

Indycars

Administrator
Staff member
The TBucket has had used a single flare for the brake lines since 1979 when the car
was first completed. It had this CF plumbing that we cobbled together in 1979, at the time
and it worked, so it never got replaced until now.

FP01_FrontBrakeOldSetup_00458.jpg

The inverted brake line Tee and the inverted flare to AN4 adapter were not compatible,
the adapter only caught about 2 threads and when I tightened it stripped. I looked at
several online sites, but they all had the same two Tees. Maybe the other Tee would
work, but I was not willing to try it out. I backed up and bought all the fittings I needed
to go straight AN fittings except at the MC. I already had the Rigid (PN 377) 37°
flaring tool.

FP01_BrakeFittings_02715.jpg

Next was to 3D print my own bracket for the two bulkhead (see PN at bottom) fittings.
So I fired up my 3D program called FreeCAD, a parametric 3D modeler to design
the brackets. It took several prints to get the hole sizes perfect to give me a snug
fit on the Tee. The 3D printer is accurate to about .006".

FP01_FreeCAD_BrakeFittingSupport.jpg
FP01_FreeCADBrakeFittingSupport_02702.jpg
FP01_LeftFrontBrakeTee_02710.jpg
FP01_RightFrontBrake90Fitting_02706.jpg

Next I needed a brake line support, so back to FreeCAD and several more test prints to
get exactly what I wanted. Below you can see the printer at work. My front cross member
is 3.5 inches in diameter, so I made the support to fit the curve. I made the hole for the
brake line about 190° so it would just snap-in place.

FP01_BrakeLineSupportPrinting_02737.jpg
FP01_BrakeLineSupport-Front.jpg
FP01_BrakeLineSupport-Front_02741.jpg
FP01_BrakeLineSupport-FrontInstalled_02750.jpg

Most plastics can be smoothed more than what you see above with Acetone or you
can use some body filler and paint to get exactly what you want for a surface finish.

FRA-583304 90 BULKHEAD STEEL
$10.44

FRA-583404 BULKHEAD TEE STEEL
$15.19

FRA-592404 BULKHEAD NUT STEEL
$11.37

SUM-220433-6N 4 AN TUBE NUTS 6PK NICKEL
$6.99

SUM-220434-6N 4 AN TUBE SLEEVES 6PK NICKEL
$6.99
 
Thank you sir !

There are almost as many plastics as there are colors available. One in particular is ABS, that
is used in alot of automotive applications and can withstand pretty high temperatures. Another
one I want to try stays flexible, so I'm wondering if I can print some gaskets.
 
if I send you a 3d diagram of a part, thats basically a flattened ,trapezoid ring,
about 3/8" thick and about 12" x 10" with a rim width of about 1" is that something you could print
I think theres a market that might be profitable to fill.
 
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