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I just bought a 1990 Nissan Hardbody and the day after I picked it up I was driving home from work and noticed my break petal had to be pushed to the floor which caused my back tires to lock up. Well I got home and looked and still had break fluid (which tells me there is no leak. Right?) I also changed the master cylinder, then bench bleed it then began to bleed the brakes... Well I would began to get a good petal after bleeding all the tires but when I take my foot off the break and wait about 15 seconds and push back down on the petal it goes all the way to the floor. I have put 3 master cylinders on it and done the same thing I just said again I have check every possible spot for leaks and there is absolutely nothing!!! Any suggestions??!??

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Most likely the front brake hoses are worn.

Posted on Nov 25, 2013

  • Taylor Darnell Nov 25, 2013

    From the master cylinder to both my front & back breaks are brass line sets... it's not a hose. I've lifted the truck up and went through and check every where. There's no leak whatsoever

  • Nathan Alex
    Nathan Alex Nov 25, 2013

    then ur rear brakes are out of adjustment or the brake drums are out of specs



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SOURCE: Replaced master break cylinder bench

You have air in the system, no matter that you bench bled the Master cylinder, air got in the system that is the only cause of this symptom other than a defective new part. Follow the guide lines below to bleed brakes.

To properly bleed the brakes, start with a couple of 8-ounce cans of fresh brake fluid. An unopened can has a long shelf life. An opened can should be discarded within a few weeks. Get the vehicle up in the air and remove all four wheels, you might be able to do this with the wheels on if you can swing a wrench on the bleeder valves. PLease read through the instructions completely before you start work, do not let the Master cylinder run dry of fluid.

Have a helper pump up the brake pedal, then open the right rear brake bleeder and bleed it until you don't hear anymore air bubbles coming out and the fluid stream is steady, next move to the left rear wheel and repeat, then to the right front and bleed that wheel cylinder, then repeat at the left front wheel cylinder. A tip hear, soak the bleeders with WD40 before you try to crack them open, DO NOT STRIP/ROUND OFF THE CYLINDER BLEEDERS, Use a box end wrench to get a good bite on the bleeders. When all the air is out of the system the fluid will be steady and not make a spurting noise, do not run the master out of fluid!

Posted on Jan 23, 2011

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