Question about 1993 Buick LeSabre

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I replaced the master cylinder in my 1993 Buick LeSabre. As one drives and depresses the brake pedal the brakes engage and will not release. For some reason the fluid does not seem to be getting back into the master cylinder even though the brake pedal is released. The car's brakes were on so hard I could not drive it. By opening the brake lines at the mater cylinder and releasing some brake fluid the brakes de-energized and I could then drive the car. Any Thoughts? Thanks Joe

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  • zebarth Nov 12, 2009

    Yes the car has ABS but the ABS has been disconnected for over 3 months now. The existing master cylinder had bad seals and had to be pumped to get it to hold pressure. It was only after I replaced the master cylinder that I got this problem.

  • yadayada
    yadayada May 11, 2010

    do u have ABS?

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Did you ever fix the problem?

Posted on May 27, 2010

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You have a 16 year old car and I would bet the brake fluid has never been changed. First thing to do is replace all the brake fluid in the system and bleed the brakes. Start at the RR then LR >> RF and end at the LF. The contaminated brake fluid may be causing the calibers to stick. You may end up having to replace the calibers. It is also possible you have a brake hose that is collapsing. If so the brake hoses will need to be replaced. It can also be the brake booster causing this but that is rare. Possible but rare.

Posted on Nov 12, 2009

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I have a 2004 Land cruiser and changed the right rear brake cyl and brake shoes . What is the proper procedure to bleed the rear brake system. Thank you for your help.


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  2. If the master cylinder was disassembled or if the reservoir becomes empty, bleed the air from the master cylinder as follows:
    1. Disconnect the brake lines from the master cylinder.
    2. Slowly depress the brake pedal and hold it.
    3. Block off the outlet plug with your finger, and release the brake pedal.
    4. Repeat 3 or 4 times.

  3. Bleed the brake starting with the one furthest from the reservoir and then the next furthest, etc.
  4. Depress the brake pedal several times, then loosen the bleeder plug with the pedal held down.
  5. At the point when fluid stops coming out, tighten the bleeder plug to 11 Nm (8 ft. lbs.), then release the brake pedal.
  6. Repeat until all the air in the fluid has been bled out.
  7. Repeat the procedure to bleed the air out of brake line for each wheel.
  8. Check the fluid level and add DOT3 fluid if necessary.

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My 1994 buick lesabre's brakes will not work. I have low brake fluid and the brake pads were just replaced. My friend said that there was brake fluid leaking from the car and that I might need a master...


if you can see a good amount of wet brake fluid between the brake master cylinder and the brake booster. and you have been adding fliud often,you could have a bad master cylinder. it has to be replaced not rebuilt. you however may have a far more common problem, a rusted through brake line.have someone pump the brake pedal, than look under the car for a brake fluid leak ,repair as needed. than bleed the brakes for a good hard brake pedal
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still got air bleed more

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