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Is the squeak related to speed? In other words, does it speed up when the vehicle speeds up? Is it the exact same sound as before the brake work was done? Were the rotors replaced also?
Often times an ABS issue is related to a wheel speed sensor. Here is a link that explains how to check:
https://www.2carpros.com/articles/abs-wheel-speed-sensor-test
Let me know. Also, let me know how it was determined that the pump was bad and not a wheel speed sensor. Did they scan the computer to determine a bad pump?
If it is at all possible, record the sound you hear and upload it for me to hear. It may help me determine the cause.
Take care,
Joe
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Tuesday, June 18th, 2019 AT 8:14 PM