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Whistle from Power Brake Booster?

Discussion in 'Tacoma Videos' started by prerunnerSD, Aug 30, 2010.

  1. Aug 30, 2010 at 1:19 AM
    #1
    prerunnerSD

    prerunnerSD [OP] "I Brake for Tailgaters"

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    01 Tacoma Limited 6 cylinder 4X4
    Grill guard Front and rear Bilstein 5100's Front Coilovers Rear AAL "I Brake for Tailgaters" Firestone Destination A/T (P265/75/R16)
    I hear a high pinched humming sound coming from under hood of car, started when I depressed the brake and now happens nearly all the time, goes away when I accelerate/ have gas peddle depressed. Brakes seem to be working fine otherwise. What should I do?

    http://www.youtube.com/watch?v=y5jBPvqtk_s
     
  2. Aug 31, 2010 at 12:11 PM
    #2
    Hiatt1991

    Hiatt1991 Well-Known Member

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    How interesting. It sounds like air rushing. Sorta like a jet. Maybe there is a loose connection somewhere or a rip?
     
  3. Aug 31, 2010 at 12:28 PM
    #3
    mjp2

    mjp2 Living vicariously though myself Thor

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    Simplified for the sake of explanation, the brake booster contains a rubber diaphragm. On one side is a vacuum, and on the other it's normal ambient pressure. When you press on the brakes, that vacuum helps pull the brake linkage so you don't have to step as hard on the pedal.

    You may have a leak inside the brake booster. Small enough to not completely lose the vacuum, but big enough to make noise. Might just be time for a new booster.
     
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