[Diy_efi] (off topic) Disk pad wear reduction with hydraulic reverse val

[Tlsalt at aol.com]

Mike wrote,

So can anyone suggest a discontinuous setup which might
(for example, one possible) return the oil that was retracted to achieve
the minimal additional pedal push prior to full application
and still achieve satisfactory brake operation when required ?

It might well be complex or <sigh> a bit more sophisticated then
the 'olden' ways of doing things which you dont seem to want to
entertain - but hey whats wrong with thought along those lines ?

Hello Mike,

If you are serious about this subject, I suggest you take a look at the 
original Dunlop disc brake calipers fitted to Jaguar cars in the late 1950's. 
The Dunlop cylinders have a spring loaded "retractor pin" at the bottom of 
the cylinder that fits into a "retractor bush" in the center of the back of 
the piston.  When the brakes are applied, hydraulic pressure pushes the 
pistons forward and the retractor pin goes along for the ride, tensioning the 
spring. When the hydraulic pressure drops, the spring pulls the retractor 
pin, piston and pad away from the rotor surface.  The pads have a "T" shaped 
slot in the metal backing plate and are mechanically  connected to the 
pistons.  This system was used up until 1963, when they discovered that it 
made no difference in pad wear, or noise and it was abandoned.

Paul

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