Peter and Dwayne---Unlike the rear brake shoes, which retract by
extension springs, the front discs rely on rotor run-out to knock the
pads back. Rotors rarely run true. In fact, a lot of cars including
Triumph, suffer from some wheel tilt during corner turns, which push the
pads (and their pistons) back even more than necessary. That's why it's
important to keep the wheel bearings snug.
For a shameless commercial on this subject, check out the Spring, 2001
Newsletter from the 6-PACK Club, titled Brake Pedal Drop.
Similar 'engineering' is used in the clutch area, to push the throw-out
bearing back away from the diaphragm fingers after the clutch pedal is
released.
Dick Taylor
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