Question about 1993 Buick Park Avenue
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.
Posted on Jun 16, 2009
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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Posted on Jan 02, 2017
Tips for a great answer:
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Please see my tip at http://www.fixya.com/cars/r6003525-abs_traction_control_lights . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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