Boris3 said:
With electrical parts knowing that is was working when it was pulled and/or dealing with a reliable seller is the safer bet. Sensors can get trashed. E30 ABS module in the earlier models had an external relay under the dash. The relay has a fusable link inside that can get shorted out but easy to replace, some folks replace by resoldering the link or replacing the relay with an inline fuse. So if you have a module issue check the relay first. Later model e30s (1989-on) don't have that external relay and instead have an internal relay in the ABS pump unit under the plastic cover. https://www.r3vlimited.com/board/showthread.php?t=107828
Thanks! That's a great reference.
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