Thank you for your feedback. So obviously the abs motor gets tested or activated when power is on. Mine sounds louder can only mean bearing or brushes problem inside the motor. It is not weird now for the mileage 389K kms. But at least good to know that noise is not from other mechanic issue. Bottom line just unplug the abs relay or fuse to disable it temporarily when in sudden failure.

 

Just for info, my truck has 152,000 miles on it.

 

maybe I was wrong. it may not be the abs motor, it could be the abs solenoid which controls valves. the noise and vibration only last for about 1 second, very hard to identify what caused that.

 

You ever figure out that noise? I have the exact same noise. My truck acts like it’s not getting air or gas when I’m going at a constant speed of 45 mph. Wondering if that noise is connected.

 

How does it act as if it's not getting air or gas? Is it kinda shuddering or hesitating? Is it at 45 mph with light pressure on the gas just maintaining speed in overdrive? That's a low grade misfire, spark plugs and/or coils. How many miles on them? Are they Motorcraft plugs? What year and engine?

 

it shudders. If I give it more gas it just Bogs down. I had plugs and packs replaced in Aug. 2001 F150 Lariat 5.4L 4x4.

 

What brand plugs and coils? How many miles on your fuel filter? Any OBD2 codes?

 

No, it isn't related.

The OP was noticing the ABS pump motor self test that is normal.

You are encountering something completely different, probably a misfire, fuel delivery issue, or similar. I'd put my money on a "mild misfire" condition.