guitarfish 0 Report post Posted October 21, 2007 Hey There, My 1990 525i has a problem (maybe) with the ABS Hydraulic Control Unit. After ABS has functioned the ABS light comes on and the HCU whines for an hour or two after the ignition is turned off. Seems a bit excessive to me. What I want to know is: Is this normal? What is the HCU trying to pressurise? If it's not normal, what can I do to fix it? Quote Share this post Link to post Share on other sites
guitarfish 0 Report post Posted November 8, 2007 OK - failing that - Does anyone know how to disconnect the ABS system. This problem keeps running my battery down. Quote Share this post Link to post Share on other sites
BM WORLD 1283 Report post Posted November 9, 2007 i have abs units . easy to unplug and swap over . 021433600 Quote Share this post Link to post Share on other sites
