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Brake booster making popping sounds

Tiny
LIZCOOKSRA
  • MEMBER
  • 1992 HONDA ACCORD
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 228,000 MILES
While in Park with engine on, or while car is moving slowly with or without brake pedal depressed, there is a distinct gurgling/popping sound coming from the brake booster or so close to it that it appears to be the brake booster. Any suggestions as to what the problem is and whether this is an immediate safety issue?
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Sunday, October 6th, 2019 AT 3:47 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Welcome to 2CarPros.

The brake booster on this vehicle operates on engine vacuum. To eliminate that as a possible issue, I need you to disconnect and plug the vacuum supply to it and then start the engine to see if the noise is gone. Note: With the vacuum hose disconnected, you will lose power assist, so don't drive it until it's back together.

I attached a picture below and highlighted the hose I am referring to. If you don't plug it on the engine size, it will cause a large vacuum leak and the engine will most likely not stay running.

Do this and let me know if it makes a difference.

Take care,
Joe
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Friday, April 9th, 2021 AT 1:32 PM

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