[DeTomaso] Brake master plumbing

[Will Kooiman]

I would think you're correct - larger rear outlet 1-3/8" goes to the front, smaller front outlet 7/8" goes to the rear.

The front 6-piston has more surface area on the pads, so it needs a bigger bore on the master.

But if it's all together, how does it drive?  Is the proportioning about right?  Is there an external proportioning valve that might be fixing the mismatch?

On 7/20/22, 1:42 AM, "DeTomaso on behalf of Asa Jay Laughton via DeTomaso" <detomaso-bounces at server.detomasolist.com on behalf of detomaso at server.detomasolist.com> wrote:

       Hi all,
       This brake master cylinder is installed in a Pantera with Wilwood
       six-piston brakes front and rear:
       The master has a stepped bore.  The larger at the rear measures 1-3/8"
       and the front bore is smaller (probably 7/8" or an inch; I forgot to
       measure).  The question is, which port on this master is supposed to go
       to the front brakes?
       In my experience, most brake master cylinders of this type have the
       larger reservoir going to the front brakes, and the smaller to the
       rear.  In my experience most masters of this type have the front brakes
       plumbed to the rear outlet (meaning the outlet closest to the pedal
       with the larger reservoir).
       Since this is a non-stock installation, and I know some variations can
       mean the front brakes plumb to the front, I am curious which port on
       this master should go to which end of the car.  I question this because
       I did not find this plumbed the way I expected, and maybe that is fine.
       This particular system may have been originally installed by Bobby
       Byars, who is unfortunately no longer available for consultation.
       I thank you in advance for your thoughts on this.
       Thank you,
       Asa  Jay
    --
    Asa Jay Laughton - W7TSC, MSgt, USAFR, Retired
    Spokane County ARES-RACES-ACS EC/RO
    ******************************
    [1]https://w7tsc.org
    [2]https://www.teampanteraracing.com

    References

       1. https://w7tsc.org/
       2. https://www.teampanteraracing.com/
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