Humming sound when applying brake pedal

Tiny
ANAETOH
  • MEMBER
  • 2000 TOYOTA SIENNA
  • 21,678 MILES
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.
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Saturday, December 14th, 2019 AT 4:14 AM

1 Reply

Tiny
KASEKENNY
  • EXPERT
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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Saturday, December 14th, 2019 AT 4:56 PM

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