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Thread: Brake Problem

  1. #1

    Default Brake Problem

    I have a 89 fullsize Blazer Straight axle front and rear. With brake booster and regular master cylinder. No hydro boost. The problem I am having is after I gravity bled and had someone pump the pedal as I open the bleeder screw, I have no air bubbles coming out of the wheel cylinders or calipers. Just clean fluid, the pedal feels solid until I start the truck and step on the brake pedal then it goes almost to the floor. I can pump the pedal a few times and build pressure but then as you hold the pedal down it slowly goes back down. If I turn the truck off it feels like it has a solid pedal again. Any help would be appreciated???
    Dan

  2. #2
    Jr. Engineer
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    Jan 2009
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    Default

    Maybe try bleeding it at the master cylinder as well. otherwise you may want to search and see if you can find if it has a specific bleeding sequence and try that.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  3. #3
    Moderator
    dwill3015's Avatar
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    Default

    Welcome to the site!
    Darcy
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  4. #4

    Default

    welcome to the site
    try to find the bleeding sequence and try it like that

    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)

  5. #5

    Default

    Welcome to the site. Try bench bleeding the master cylinder first. If the pedal continues to go to the floor after that, then I would start looking for a leak somewhere. Check your pedal push rod, sometimes the seal in the MC goes bad and can start to leak down the rod and into the cab. Good luck.
    Scott

    ΜΟΛΩΝ ΛΑΒΕ

    '94 Chevy Suburban K1500
    3" exhaust w/ aero turbine non-baffled muffler
    CFM Technologies TB spacer
    CB w/ 44" whip antenna


  6. #6

    Default

    When you are bleeding the system, the truck must be level. If not level, air can get trapped in the high part of the wheel cylinders/calipers. Other than that, it sounds like you may have a leak at one of the wheels.
    Gary

    99 K 1500 Suburban
    78 Silverado Big 10 w/factory 454
    00 S-10 Blazer
    1976 Trans Am
    1980 Honda CB900 Custom

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