[DeTomaso] Poor brakes

[Larry - Ohio Time Corp]

I have made a screw in "holding pin" that replaces the light switch. It
holds the shuttle in place when you bleed the system. This keeps the light
off if you are only bleeding 1/2 the system.

Larry - Cleveland


-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of forestg at att.net
Sent: Friday, July 10, 2009 2:16 PM
To: detomaso at realbig.com
Subject: Re: [DeTomaso] Poor brakes


 The amount of flow has nothing to do with moving the shuttle. It operates
strictly on pressure differential and since the master cylinder design keeps
a constant pressure due to the rear piston moving the front piston by the
pressure developed it is constantly self compensating. Aw forget it. I'm
tired of trying to explain how these things are supposed to work to people
that have their minds made up and do not want to be confused by facts.
Forest

  -------------- Original message from JDeRyke at aol.com: --------------

In a message dated 7/10/09 7:26:29 AM, forestg at att.net writes:

To clarify; the shuttle valve does not indicate pad wear. It's purpose is to
alert you if you lose pressure to one side such as would happen if a line
broke or a caliper seal leaks.

To clarify: if a pad wears, more fluid is used in that part of a caliper
during braking which moves the shuttle, indicating pad wear, as well as what
you describe. I know you like this infernal device, but it really needs the
modification that AMC and others did- adding a spring on both ends of the
bore to help return the shuttle from the ends of the bore. The trouble often
starts when one bleeds the brakes and the motion of the fluid bled out
drives the shuttle far to one side where varnish sticks it in its bore. I've
cleared several shuttles that were stuck solid, Larry Stock has done the
same in his shop, and Roger Sharp has found at last one during Nor-Cal Tech
sessions. I believe its an endemic problem to the Pantera best fixed by
eliminating the thing entirely. My 2¢- J Deryke


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