Humming sound when applying brake pedal

2000 TOYOTA SIENNA
21,678 MILES
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ANAETOH
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my car makes humming sound when i applied brake pedal and also when i enter into a pot hole. I have changed the ABS but the sound still persisting but the sound stop if i disconnect the ABS wire from the ABS Block chamber. the brake system is working perfectly when matched.
Dec 14, 2019 at 4:14 AM
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KASEKENNY
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This is called an ABS activation event. That means that the ABS is thinking that it needs to pulse the brakes due to some aggressive breaking situation. I attached the basic operation of the system. Most important thing is the signal inputs to the ABS that it looks at to determine if it is needed. I suspect you have an issue with the stop light switch. It may not be the sensor itself but I suspect the issue is with this input. Do you have a scan tool that we can look at the switch state and see what the pressure it is reading?
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Dec 14, 2019 at 4:56 PM