Question about 1993 Buick Park Avenue

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I have a 1993 buick park avenue with abs system.It all started when the brake lines rusted out, had new ones made.I had to take the abs motor off to get some fittings off,reinstalled it back on the car.When I tryed to bleed it, the system had a lot of air in the right front left rear.Kept bleeding but no luck on the air in the line issue so I started the vehicle and kept pumping until the fluid came out clear.The car stops but the brake is spongy not firm rebleed with no air in the system.Could it have damaged the pump when the lines run out of fluid.The owner said all you had to do is just touch the brake had firm pedal.Any help would be appreciated.Thanks art

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  • arts65blacki Jun 16, 2009

    the car didnt sit for a year. When I took the abs assembly out of the car the fluid was contaminated.I must have bled the thing 12 or more times it still didn't help.The pedal is not firm

  • arts65blacki Jun 17, 2009

    yes

  • Murtaza Akberali  Versi
    Murtaza Akberali Versi May 11, 2010

    As you apply the brakes does the pedal travel in slowly to the floor?

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It does sound like the pump is possibly bad. But, here's a really complete description that I use all the time and it can help you rule out a myriad of other issues before you go replacing parts. You could possibly still have some air trapped in the system.

http://www.babcox.com/editorial/bf/bf90420.htm




Posted on Jun 16, 2009

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Hi,

Ok, you are most likely having problems due to contaminated brake fluid. Is the fluid clear, or dark? Whenever a car has the brakes changed, the fluid should be flushed out, which is accomplished by bleeding the lines. The former owner probably didn't flush out the brake fluid ever (this is a very neglected car maintenance), and letting the car sit for a year just corroded everything that's attached to the lines (calipers, brake cylinders). !st thing to do is spray all your bleeder valves w/ wd-40 or some type of penetrating oil so u can bleed the brakes. From your description, you should probably remove the calipers and brake cylinders, disassemble them, and see how corroded they are. I guarantee you'll find pitting and corrosion inside. You can attempt to rebuild them, but it's much easier (and sometimes cheaper as far as brake cylinders anyway) to buy new or rebuilt units. You will still have to bleed the system to remove the old fluid. Start at the bleeder that's the greatest distance from the master cylinder, then go to the next furthest away, to the next, then the closest bleeder. You want to bleed them until the fluid is clear for a while on each wheel. If u find corrosion in the caliper or brake cylinders, you probably will want to change the master cylinder (well u won't want to, but u should!). Sorry for the bad news, but you'll have great brakes when u r done. And by the way, I had a car many years ago that kept having problems w/ calipers and brake cylinders failing, and I finally realized far too late, that it was the fluid causing it. Fluid absorbs moisture too, and that will destroy your components, always close the brake fluid bottle very tight after use!

Thanks for contacting Fixya

Posted on Jun 14, 2009

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