1988 Cadillac El Dorado POWER ABS BRAKES

1988 CADILLAC ELDORADO
174,000 MILES • 4.5L • V8 • FWD • AUTOMATIC
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RUDDYMEN
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  • 9 POSTS
THE VACUME PUMP ON MASTER CYCLINDER WONT RUN.TESTED PUMP WITH 12 V. CURRENT AND IT RUNS.WHAT CONTROLS THE ABS PUMP THE ECM.NO POWER AT THE PLUG THAT GOES TO THE PUMP WHEN KEY IS ON OR CAR IS RUNNING.WOULD THE MASTERCYLIMDER RUNNING LOW ON FLUID BE THE PROBLEM I HAVE ALLREADY BLED THE BRAKES AND FIXED THE LEAKS.
Jan 22, 2014 at 3:03 AM
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DOCDTC
  • ✓ASE Certified Mechanic
  • 53 POSTS
  • ASE Certified Mechanic
hI,
From the information I am able to access, Your brake booster should be run just by manifold vacuum. Are you speaking of the ABS pump? It is run by the EBCM - electronic brake control module.
Jan 22, 2014 at 5:03 AM
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RUDDYMEN
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  • 9 POSTS
yes the abs pump.
Jan 22, 2014 at 5:59 AM
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DOCDTC
  • ✓ASE Certified Mechanic
  • 53 POSTS
  • ASE Certified Mechanic
The ABS pump will only run when the ABS system is in active mode, ie., during a stop when it senses lockup on one or more wheels. There should be current on the feed line, it is fed by the ABS relay. If you would like I can send you the wiring schematic for the system
Jan 22, 2014 at 9:42 AM
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RUDDYMEN
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  • 9 POSTS
please send schamatic
Jan 22, 2014 at 9:54 AM
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