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

[Mike]

mmmmm, Tah,

Well I'm serious up to the point (so far) of appreciating earlier
efforts in this direction and will certainly follow up your lead,
and from that perspective I'm interested in what metric was used
to gauge whether it was worthwhile or not - with all sorts of
inherent assumptions about wear versus fuel consumption delta over
what period of time etc. It does sound like a neat and practical idea
which saves intercepting hydraulic fluid and all the complications that
could entail, thanks again for the lead, will check it over weekend,
next thing to check is the issue of light greased vs sealed oil bearings
for the wheels <sigh>

*grin*

Thanks for going to the trouble to describe this :)

Rgds ~`:o)

Mike



At 08:08 AM 12/6/02 EST, you wrote:
>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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