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The (front) wheel sensors have the cable (look like TV cable) routed near
the shock towers. Find them and disconnect. Then measure the
resistance. Both sensors should be less than 1400 ohms and the reading
should be close to each other. The rear sensor (only one) is on the
differential which has different reading (and I forget).
<p>The system works this way: when wheels turn, the sensors develop small
voltage. The computer constantly compares the voltages and engages
ABS when voltages differ over a threshold. If the sensor is out of
range, the voltage is out of range too. Even when wheels turn in
same speed, the voltages make computer 'think' they are not.
<p>The voltages generated by the sensors can be measured (on rollers) but
it is not easily done on jacks. If I remember right, the procedure
can be found in the service manual.
<p>Bert Cross wrote:
<blockquote TYPE=CITE>My 1986 420 SEL's brakes seem to have the ABS always
on. At the end
<br>of a stop (fast or slow), the pedal shudders at the end of the stop.
<br>Neither my mechanic or I can figure it out. The sensors seem
<br>working. What else could it be?