Actually,
many calipers are designed so that the seals will retract the pistons a slight
amount, then hold them close to the disc. The Dunlop design doesn't do this,
and thus the 'postie' thingus (and its mating clip in the piston)
The ubiquitous ATE and any other piston that uses a square section seal in a
tight groove work this way...
Toby
> Standard disk brakes do not retract but simply release the hydraulic pressure.
> The ones on the roadster are copies of Dunlop racing brakes and actually do
> retract a fraction of an inch but these are exceptions. The pads are still in
> such close proximity that they will rust to the disks.
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