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Re: 1989 9000 ABS Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 26 Apr 2001 13:15:05
In Reply to: 1989 9000 ABS, Mike Haskell, Wed, 25 Apr 2001 22:15:15 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The ABS pump supplies pressure for the ABS system AND provides brake boost. If the ABS pump isn't running, you won't get pressure, and the pedal will be hard. However, if you have low pressure, you should have BOTH the ABS and Brake Fluid lights on at the same time. If all you get is the ABS light, and the Brake Fluid light is off when driving, then there is probably an ABS sensor problem and the hard brake pedal is a master cylinder problem.
After the car has been sitting for a few hours, overnight is best, do these tests:
First, open the hood and look at the brake fluid reservoir. Note where the fluid level is. It should be well ABOVE the line that says 'full with charged accumulator'. Next, turn the key to ON - you should see both ABS and Brake Fluid lights, along with a few others, like the battery and oil pressure. If you don't see a Brake Fluid light, then get the bulb replaced. Now, start the car. The Brake fluid light should go out after a few seconds - it may take 5, it may take 30. The ABS light should wink out shortly thereafter.
Now, get out and check the fluid level - it should have DROPPED down to the Full line. This shows that the ABS pump has pumped fluid from the reservoir into the pressure accumulator. The ABS and Brake Fluid lights going out means that the accumulator has been pressurized.
If the lights didn't go out, or the level didn't drop, then there is a problem with the ABS pump, or the pressure switches or relay that drives it. If the level drops, then you know the ABS pump is running.
If the ABS pump runs and brings the level down, but the brake pedal is hard, then you have pressure but no brake boost. The problem lies in the master cylinder. If the ABS light alone is intermittently on, you probably have a bad ABS sensor - most likely, a worn or frayed wire from the sensor. A dealer can read out the ABS code and determine which sensor is giving the problem. There are other troubleshooting methods, but that's a start for now.
Good luck!
, Thu, 26 Apr 2001 13:15:05 <-- Viewing This Message
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