Question about 1989 Chevrolet K1500

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Brake pedal going all the way down after installing new brakes

Have installed new brakes front and back and brake pedal still goes all the way down

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  • smithfrances Jan 17, 2009

    Once engine is started, brake pedal goes to the bottom of the floor, with engine not running, you have brake pedal pressure.



    Yes to the above questions, I did bleed brakes first and top with brake fluid.



    Also, replaced the master cylinder and caluber on right front brake

  • smithfrances Jan 17, 2009

    Do you think while installing the master cylinder, something could have been done incorrectly to cause this problem?

  • smithfrances Jan 19, 2009

    Do you think changing the master cylinder out again would help, is something suppose to be done to the master cylinder before installing it?

  • Anonymous Feb 22, 2009

    brakes go to the floor when I start my engine,but I have brakes when it is not running. I have put on a new master cylinder and before I put it on I bench bled and then bleb each wheel indivdually. I changed all the lines and nothing is leaking,I also have all my fluids filled.

  • RAY CRAZE
    RAY CRAZE May 11, 2010

    who installed the brakes??? did they bleed the brakes and top off the brake fluid...

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  • 53 Answers

This is probably caused by a worn out master cylinder, once that is replaced it should solve the problem.

Posted on Jan 16, 2009

  • David Donnelly
    David Donnelly Jan 19, 2009

    Before installing the master cylinder, it needs to be "bench bled", and then bleed each wheel individually.

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1 Answer

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I have installed new front and back brakes,new calipers,brake lines,and now thanks to bad advice a new master cylinder and my pedal still goes to the floor.we have bled the lines many times and tried to...


Have the engine running & bleed the brakes again

Have someone in the vehicle slowly push the brake
pedal,never pump.

When you are driving, do you pump your brakes,NO

Pushing the brake pedal only moves the piston in the
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That amount of movement will build up to 2,000 lbs
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As the person is pushing the pedal down,someone
else opens & then closes the bleeder valves while the
pedal is still going down.

Then you wait on the person in the car to start over.
Real simple.

Assuming you paid for all that work,why do you have
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Don't want to discuss what the pros do,but we have
a thousand people on this site every day with problems
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