[DeTomaso] Brake question

[Julian Kift]

That is exactly why I am asking, I think generally for the new owner there might be some confusion out there over the 'shuttle' and 'proportioning' valves and someone might be tempted to 'gut' the shuttle valve instead of the proportioning valve. That would be bad as it connects all brake lines a singular system, but might explain why Rob lost all pedal when the fluid boiled.

Julian

To: julian_kift at hotmail.com; rob at dumoulins.net; jb841 at cox.net
Subject: Re: [DeTomaso] Brake question
From: pantdino at aol.com
CC: detomaso at realbig.com
Date: Sat, 12 May 2012 23:48:06 -0400


The only purpose of a shuttle valve is to trigger the brake warning light. It's not really a valve. 


If it is removed the front line going into it should be connected to the front line exiting it and rear to rear, as if the thing never existed.


 


If someone mistakenly puts a T fitting in or fiddles the shuttle to make it act like one, you no longer have separation of the front and rear braking systems and a leak anywhere will result in no brakes at all.








-----Original Message-----

From: Julian Kift <julian_kift at hotmail.com>

To: rob <rob at dumoulins.net>; jb841 <jb841 at cox.net>

Cc: De Tomaso List <detomaso at realbig.com>

Sent: Sat, May 12, 2012 8:32 pm

Subject: Re: [DeTomaso] Brake question






I'm trying to picture how you brakes are plumbed, normally a proportioning valve 
is in a singular line (typically rear, but stock on the Pantera is front) adn it 
limits the flow in that line.

When the shuttle valve was removed how were the lines connected together?

Julian

> Date: Sat, 12 May 2012 20:53:36 -0400
> From: rob at dumoulins.net
> To: jb841 at cox.net
> CC: detomaso at realbig.com
> Subject: Re: [DeTomaso] Brake question
> 
> Shuttle valve is removed. Circuits isolated with a modern proportioning
> valve.
> On May 12, 2012 1:16 PM, "John Buckman" <jb841 at cox.net> wrote:
> 
> > >>>I no longer have the shuttle valve installed, it that matters.
> >
> >
> > Rob,
> >
> > The shuttle valve also incorporates the brake light switch.  If the
> > shuttle valve were removed,
> > the brake light switch would have to be plumbed back into the hydraulic
> > line or a mechanical
> > switch would need to be added to the brake pedal.
> >
> > If the shuttle valve were removed, and the brake lines were all connected
> > together instead of
> > "splitting" the hydraulic system (which is what the shuttle valve "block"
> > does), then any problem
> > in the hydraulic system (boiling of fluid or loss of fluid due to a leak)
> > would affect all four corners
> > of the car, and would cause the brake pedal to go to the floor.
> >
> > John
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