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  1. #11


    When the message " Service Brake System " comes on the vacuum booster is not keeping the brake booster reservoir at the correct vacuum. Check the booster pump mounted on the brake booster for operation. Check your FSM for more information. The Hydraulic system is not at fault.

  2. #12

    Join Date
    Sep 2010
    everett, massachusetts


    your saying a 2006 silverado 1500 has a booster pump ?

  3. #13


    Have you looked at the brake booster????

    Quote Originally Posted by j cat View Post
    your saying a 2006 silverado 1500 has a booster pump ?
    Last edited by redvett; 12-02-2012 at 07:25 PM.

  4. #14

    Join Date
    Sep 2010
    everett, massachusetts


    2006 1500 has a booster pump ?
    I never seen any booster pump on a 1500 vehicle.

    engine vacuum supplies the booster vacuum to the booster.

    I just looked this up to find that some of these vehicles had installed a vacuum pump to increase braking power if the vacuum supplied by the engine is insufficent.

    the message would say " SERVICE BRAKE BOOSTER " ...

    the message he got was service brake system. with the fluid low that would be what I would expect to occur.
    Last edited by j cat; 12-03-2012 at 07:56 AM. Reason: added more info

  5. #15


    Reading through the posts, I am going to have to say that I agree With @RayVoy . It has to be a fluid issue. Whether the fluid is low or the sensor in the master cylinder reservoir is bad/ going bad. I vote for the fluid level senser in the master. The original poster stated that the light comes on if he accelerates hard as well as when he brakes hard. The light coming on when accelerating indicates moving fluid. The brake system is not being activated at this time. As far as booster questions, The vacuum of the engine would be at its highest during a hard accel.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

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