[DeTomaso] Poor brakes

[forestg at att.net]

 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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