Question about 1999 GMC Sierra

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1999 GMC Sierra brake problem

Changed brake line and master cylinder, bleed all the lines and still no brakes! Hit the brake pedal and it goes all the way in. Help!

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  • isaacironwor Sep 04, 2008

    Backed off the bleed screw and had someone step on the brakes. Then closed the bleed screw and they took their foot off the pedal. Then repeated it again until there was no air.

  • isaacironwor Sep 04, 2008

    Have tried all that you suggested!

  • Daniel Jenkins
    Daniel Jenkins May 11, 2010

    How did you bleed the brakes? There are several ways of doing this, and you must do it with the engine off.

  • Anonymous Mar 23, 2014

    change the master cylinder

  • Anonymous Mar 30, 2014

    Help bleeding the brake pump and lines

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  • 359 Answers

When you change the master cylinder it is best to gravity bleed first, then proceed to the pedal technique.

Gravity bleeding is when you just open the valve and let gravity pull the fluid down.

Keep in mind you must "prime" the master cylinder first before installing it, did you do that?

Priming the master cylinder is where you put it in a vise gently, you then take apaptors and screw into the outlets, then take tubes from the adaptors back into the resoirvor. You fill the resorvoir up with fluid and take a 3/8 extension for a socket and push the piston in and out slowly until there are no more air bubbles.

After this procedure you gravity bleed the brakes, then go on to the pedal technique.

Posted on Sep 04, 2008

  • 1 more comment 
  • Daniel Jenkins
    Daniel Jenkins Sep 04, 2008

    It may be possible that you got a faulty master cylinder.. follow my steps, and if you still have no brakes, take the master cylinder back and get a replacement.

  • Daniel Jenkins
    Daniel Jenkins Sep 04, 2008

    ?? Why the thanks for trying? What did I miss? Please rerate this accurately or you will not get any more help

  • Daniel Jenkins
    Daniel Jenkins Sep 04, 2008

    please post when you figure out what the issue is.

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