[DeTomaso] Brake question

[Pantdino]

I am talking out of turn here a little because I'm assuming the shuttle valve on the Pantera is like what is on my TR6, which I just rebuilt because it was leaking. There is a seal on each end of the "shuttle", and if you just remove it there will be no seals. Fluid will pour out the switch, as it is not designed to seal anything.





-----Original Message-----
From: Julian Kift <julian_kift at hotmail.com>
To: pantdino <pantdino at aol.com>; rob <rob at dumoulins.net>; jb841 <jb841 at cox.net>
Cc: De Tomaso List <detomaso at realbig.com>
Sent: Sat, May 12, 2012 9:16 pm
Subject: Re: [DeTomaso] Brake question



hat is exactly why I am asking, I think generally for the new owner there might 
e some confusion out there over the 'shuttle' and 'proportioning' valves and 
omeone might be tempted to 'gut' the shuttle valve instead of the proportioning 
alve. That would be bad as it connects all brake lines a singular system, but 
ight 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
ubject: Re: [DeTomaso] Brake question
rom: pantdino at aol.com
C: detomaso at realbig.com
ate: Sat, 12 May 2012 23:48:06 -0400

he only purpose of a shuttle valve is to trigger the brake warning light. It's 
ot really a valve. 

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



f someone mistakenly puts a T fitting in or fiddles the shuttle to make it act 
ike one, you no longer have separation of the front and rear braking systems 
nd 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



'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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