ABS light doesn't respond to air in the lines. If there was air, you would have a low mushy brake pedal, and the red warning light would come on.
Normal operation of the yellow light is it should turn on for a few seconds after you turn on the ignition switch, then go out. If it goes out but comes back on right away, suspect a defective sensor or cut wire to one of them. If the light stays off, but comes back on AFTER you start to drive, (from a few yards to a mile), suspect a cracked tone ring on a cv joint or inside the rear brake drum.
If the light comes on right away and doesn't even flicker, suspect a blown fuse, commonly caused by a shorted trailer wiring harness. The computer always has a second power source through a second fuse to run the warning lamp.
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Monday, March 1st, 2021 AT 12:57 PM