[DeTomaso] Brake master plumbing
Larry Weston
lplugw at hotmail.com
Fri Jul 22 10:09:52 EDT 2022
FWIW, my series one 240Z (#20334) has the rear port serving the rear brakes.
In the series two cars the factory swapped ports to feed the rear brakes from the front port.
Sent from my iPhone
> On Jul 20, 2022, at 10:48 AM, Julian Kift <julian_kift at hotmail.com> wrote:
>
> In effect yes, it should not matter, although traditionally the front
> brake is connected to the Primary (rear) port, as it provides the
> safest outcome in a downstream partial loss of fluid/leak situation.
>
> Small+forward+bore+for+high+pressure+in+normal+braking.jpg
> __________________________________________________________________
>
> From: Asa Jay Laughton <asajay at asajay.com>
> Sent: Wednesday, July 20, 2022 7:36 AM
> To: Julian Kift <julian_kift at hotmail.com>
> Cc: Will Kooiman <will.kooiman at gmail.com>;
> detomaso at server.detomasolist.com <detomaso at server.detomasolist.com>
> Subject: Re: [DeTomaso] Brake master plumbing
>
> Julian,
> You wrote " The larger bore is a small section on the master cylinder
> to effect that initial take up, it is not a dual bore with independent
> proportioniong function for front and rear circuits."
> Does that mean the system doesn't care which port the front or rear is
> hooked to?
> Asa Jay
> Sent via radio waves
>
> On Jul 20, 2022, at 07:20, Julian Kift <julian_kift at hotmail.com>
> wrote:
>
> Correct, however the step bore (or more correctly quick take up) master
> cylinder provides a means to get a large volume of fluid to the
> calipers upon initial braking to take up the gap between rotor and pad.
> This was a GM truck design to implement low drag pads to meet fuel
> economy thresholds, the pads sitting further away from the rotor. The
> larger bore is a small section on the master cylinder to effect that
> initial take up, it is not a dual bore with independent proportioniong
> function for front and rear circuits.
>
> Julian
> __________________________________________________________________
>
> From: DeTomaso <detomaso-bounces at server.detomasolist.com> on behalf of
> Will Kooiman <will.kooiman at gmail.com>
> Sent: Wednesday, July 20, 2022 4:20 AM
> To: Asa Jay Laughton <asajay at asajay.com>;
> detomaso at server.detomasolist.com <detomaso at server.detomasolist.com>
> Subject: Re: [DeTomaso] Brake master plumbing
>
> 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
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