Hi,
Are the brakes working properly? Also, is the sound loud enough to record and upload for me to hear? Could the sound be a vacuum like sound?
The brakes are assisted by engine vacuum. If there is a leak, you may be hearing a noise. The power brake booster is under the hood mounted to the firewall on the driver's side. I attaches a pic below and circled the booster and the vacuum hose that goes to it.
Have a helper start the engine and apply the brakes while you check to see if that is where the sound is coming from.
Let me know.
Joe
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Friday, July 10th, 2020 AT 6:35 PM