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  1. #1

    Question Brake issues on 1999 GMC Suburban

    I have a 1999 GMC Suburban 1500. The problem I am having is when I press on the brake pedal all I hear is air like it has air brakes or something and the brakes barely stop when idling or in reverse. When the truck is off it doesnt make the air sound when I press the pedal. I have bled the brakes and it has plenty of fluid. The brake pads have at least have life and there is no air in the brake lines. Help Please!

  2. #2

    Default

    sounds like you need to replace the brake booster

    2003 Z71 Silverado LS
    Access roll up cover
    Bed Rails
    Billet Grill insert
    Bed Rug
    CB with PA system
    Waiting to be installed
    Two 8in RF HX2 punch( would have 12s but they got stolen)

  3. #3
    Sr. Engineer Dana W's Avatar
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    Default

    At least check the vacuum line leading to the booster, but it is highly likely the diaphram inside the can has split.

  4. #4

    Default

    I was afraid of that. I was hoping for the master cylinder cause its much cheaper. Thanks.

  5. #5

    Default

    Do the test first. Sometime it is a cracked check valve. Sometimes it is a rotted hose
    2010 Chevy Silverado Z71 ext cab.4x4
    72 Monte Carlo 350-415 hp- sold (June 2011) to pay medical bills
    79 Impala 350 4bbl 375 hp- sold (June 2011)to pay medical bills
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