Question about 1989 Chevrolet K1500

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1973 F250 TRUCK 4X4 BRAKE PEDAL GOING TO THE FLOOR

REPLACED THE MASTER CYLINDER, BLED THE BRAKES. WHEN PUMPING THE BRAKES, THE PEDAL BUILDS UP, WHEN RELEASED AND YOU WAIT FOR 5-10 SECONDS THE PEDAL GOES TO THE FLOOR AGAIN. WHAT COULD POSSIBLY BE THE PROBLEM?

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  • Anonymous Feb 20, 2009

    this is a rebuilt master cylinder and no, I did not bleed the brakes at the wheels. Help

  • mud_turtle Feb 20, 2009

    Thank you for your help.

  • Stan Moffett May 11, 2010

    new or rebuilt master cylinder and did you bleed brakes at wheels also

  • Anonymous Mar 13, 2014

    removal master brake cylinder 1973 gremlin

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Bleed the brakes at all 4 wheels and if that doesn't fix it would not be the fist bad master cylinder that i have had or seen rebuilt master cylinders can be good and bad
first bleed master cylinderon vechicle and then bleed brakes

Posted on Feb 21, 2009

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  • Chevrolet Master
  • 6,982 Answers

Master is internally bypassing : replace or rebuild.

Posted on Feb 20, 2009

  • Richard Scordino Feb 21, 2009

    You said in original post "bled brakes" In my world that means bled brakes.... Of course you need to bleed at the wheels!!!! Also, when replacing any component, don't assume that it actually works...I lost an entire engine last year due to a defective chain tensioner on a quad 4 gm car. PS thanks a lot to advance auto parts for not backing up their guarantee!!! (worthless)

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1 Answer

I HAVE A 95 F250 AND THE BRAKE PEDAL GOES TO THE FLOOR. I HAVE REPLACED THE MASTER CYLINDER TWICE AFTER BENCH BLEEDING, REPLACED THE BRAKE BOOSTER . BLED THE SYSTEM 3 TIMES AND THE BRAKE PEDAL STILL GOES...


You need to check wheel cylinders, the only way that the brake peddle will go to the floor like that is if there is a lose of fluid pressure somewhere .

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Replace brakes. now they go to the floor. bled air


When you fixed the brakes, did you take the lid off the master cylinder. I just wonder if you spilled out your brake fluid. The only reason the pedal should go to the floor is if the brake fluid is gone or the master cylinder is not working. Check the fuse. Check the brake fluid level. The pedal only goes to the floor if there is no back pressure in the lines between the master cylinder the lines to the brake pistion on the calipers. Please give me a good ratin and keep me informed.

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I have a 92 chrsy. 5th ave with no antilock brakes. just base brakes with rear drums. replaced master cly. due to leaking and replaced all the brake lines and hoses. i have good streams of fluid from all 4...


When you bleed the brakes are you starting with brake furthest from the master cylinder? Also was the master cylinder bench bled? If everything there is okay and you are not getting any air in fluid stream, you could try bleeding the brakes by having some one slowly pump the pedal till it is firm. Then have them let off open first bleeder valve and slowly depress to floor and hold there untol the valve is closed. repeat this at all bleeders. You may want to have car running to do this. Try this and let me know.

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Did you bench bleed the master cyl. before installing it? then when you installed the new master, did you bleed all 4 points? If yes, then check all for points for leaking caliper/s and leaking wheel cylinder/s. If the van has ABS, check the valve body for a bleeder screw and see if air bleeds out of it. If you've checked everything twice and did everything right then your new master cyl. may be defective.

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1999 Chevy S10 Blazer 4x4. Replacing rear pad's,& Bleeding Breaks


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