[DeTomaso] Brake question

[Tomas Gunnarsson]

If you can't get the wheels to lock up you have a serious issue with your
brake system. Maybe your booster is out of order?

Tomas
  -----Original Message-----
  From: Rob Dumoulin [mailto:rob at dumoulins.net]
  Sent: den 12 maj 2012 19:44
  To: MikeLDrew at aol.com
  Cc: detomaso at realbig.com; guson at home.se
  Subject: Re: [DeTomaso] Brake question


  When i got the car it would not hold pressure and there was no parking
brake cable. The shuttle valve was cracked. I removed it totally and
replaced the massive proportioning monstrosity with a modern adjustable one.
I also added two pressure gauges up front thinking i might meed to fine tune
the bias. I never did get it to lock up and leave it wide open. Girling
calipers are stock.

  On May 12, 2012 1:18 PM, <MikeLDrew at aol.com> wrote:


    In a message dated 5/12/12 9 46 16, guson at home.se writes:



    Removing the shuttle valve will not affect brake performance at all,
right?
    The prop valve is different.


    Ah, my mistake--I was confusing the two!

    Removing the shuttle valve will not affect brake performance as long as
the system is replumbed so that the front and rear systems are separate and
independent, and so long as the stock front pressure reduction valve remains
in place.

    If the shuttle valve block is kept in place and simply is gutted by
removing the internals, then you have really screwed up your brakes, because
now the front and rear systems are connected.  Any differential pressure
created by the reduction valve will be offset by the fact that the systems
are connected downstream.  The result would be excessive front
braking/reduced rear braking (same as if you removed the pressure reduction
valve), and also an elimination of any safety because now a failure in one
circuit will affect the other one.

    If the systems are mixed this way, then a dragging brake caliper that
heats up the fluid, would eventually heat the fluid to the other three
calipers.  Doom.

    Rob--tell us exactly what you've got going on plumbing-wise?

    Mike