Quote:
Originally Posted by Christ
The ABS sensor setup is a laser with a sprocket-like rotor.
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No, it is a Hall effect sensor. Put a Volt meter on it and wave a piece of steel in front, you'll see pluses. The reason they need to be cleaned is that they collect Iron filings (Byproduct of Brake pads wearing on the Rotor) and throw off the magnetic field.
That said I see no reason that Hall effect sensor couldn't be used (unless they would be thrown off by the Magnetic (flux???) thrown off by the motor. They have 1/10th Degree Resolution on many engines when used as Cam, or Crank position sensors. They are cheap, easy to find, and pretty reliable.