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Brake problem

Discussion in 'Chevy Trucks' started by chevy$men, Feb 13, 2011.

  1. chevy$men

    chevy$men Senior Member
    Messages: 119

    i have a gmc 99 2500 pick up 5.7 4x4 i just got it and the brakes was goin to the floor i put new pads new rotors and calipers and brake lines and it steel goin the floor wtf so i just replaced the master cylinder and it got a little harder but still go to the floor have you guy had this problem i need help the back brakes are fine and im thinking its the booster help.....:cry:
     
  2. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    Try and re- bleed the brakes.
     
  3. RacingZR

    RacingZR Senior Member
    from Maine
    Messages: 398

    Ya, they're not bled of air dude........
     
  4. chevy$men

    chevy$men Senior Member
    Messages: 119

    i bled them just not the back because had to line bled the back cuz the srew is fuckd
     
  5. chevy$men

    chevy$men Senior Member
    Messages: 119

    if the truck is off i pump the brakes they get hard than turn the truck on they go soft what you think???
     
  6. RacingZR

    RacingZR Senior Member
    from Maine
    Messages: 398

    Gotta bleed the whole system, starting with rear.
     
  7. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    Air in the calipers
     
  8. chevy$men

    chevy$men Senior Member
    Messages: 119

    i dont know we bleed these brakes about 3-6 in front
     
  9. chevy$men

    chevy$men Senior Member
    Messages: 119

    do you guys think its the booster
     
  10. chevyzrule810

    chevyzrule810 PlowSite.com Addict
    Messages: 1,238

    It could be the booster or wheel cylinder.Are you bleeding them correctly? First step make sure the fluid reservoir is full.With the wheels off have somebody in the truck pump the pedal 3 times and on the third pump hold it to the floor.Crack the bleeder.Do this until all the air is out and move onto the next one until all the air is out of the system.Then have them start the truck and see how the pedal is.
     
  11. chevy$men

    chevy$men Senior Member
    Messages: 119

    thats what we did that me and my guy it still go 2 the floor
     
  12. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    Any leaks around were you put on the new brake lines?Could be sucking air.
     
  13. ultimateinc

    ultimateinc Senior Member
    Messages: 143

    im having the same problem on the same truck now. my reservoir went empty and it was sucking alot of air. i refilled the reservoir and bleed them and it helped alot but noticed it was leaking from the reservoir so it sucked more air. gonna replace the reservoir tomorrow and re bleed the system again. how much did it cost you to replace the reservoir ??
     
  14. mrv8outboard

    mrv8outboard Senior Member
    Messages: 197

    You have to bleed the whole system! Start with the rear brakes, both sides, preferably right rear than left rear. Then do the right front and left front. The truck should have ABS and that may need a scan tool to finish the job.
     
  15. Jacobsmovinsnow

    Jacobsmovinsnow Senior Member
    Messages: 315

    Ya dont be jumping to conclusions to quick , do a proper bleed of the brakes as advised. You threw enough parts at it. If bleeder screw on the rear brake cylinder dont open , replace them first,............it take time when your working with old junk. Been there (Still there) Done that.
     
  16. jklawn&Plow

    jklawn&Plow Senior Member
    Messages: 469

    Buy new caliper. I had same issue with bleeder screw.
     
  17. NICHOLS LANDSCA

    NICHOLS LANDSCA PlowSite Veteran
    Messages: 4,310

    It can be a pain in the but to get all the air out of the ABS proportioning block. If the bleeders a frozen in the rear just replace the whole wheel cylinder not worth the hassle they are $9
     
    Last edited: Feb 14, 2011
  18. Mike N

    Mike N Senior Member
    Messages: 148

    Calipers on correctly? Bleeder screws on the top?
     
  19. ultimateinc

    ultimateinc Senior Member
    Messages: 143

    sorry i met replace the master cylinder
     
  20. chevy$men

    chevy$men Senior Member
    Messages: 119

    $65 with 25 core