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Pretty much normal Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 3 May 2001 11:20:43
In Reply to: Anti lock and Brake fluid light question, Rob  [Profile/Gallery]
, Thu, 3 May 2001 09:57:40
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The ABS pump pressurizes an accumulator (the black sphere near the master cylinder) with brake fluid. This hydraulic pressure is used for brake boost and to run the ABS system. The ABS pump pumps fluid FROM the reservoir into the accumulator. When the car sits turned off, fluid leaks from the accumulator back into the reservoir. Open the hood first thing in the morning, and you'll see that the level is way above the "Full With Charged Accumulator" line on the reservoir. Start the car, and you'll see the level drop down to that line. You should always check your fluid level AFTER the engine has been started and the ABS pump stops running.
So when the car has been sitting a while, the ABS pump has to run to re-pressurize the accumulator. While the accumulator is below a minimum pressure, the BRAKE FLUID and Anti-Lock lights are ON. Once the system hits a minimum pressure, the lights go off. The pump will run a bit longer to get to normal operating pressure.
How long those lights stay on is a function of how far down the accumulator pressure has gone, how efficient your ABS pump is, and your electrical system (lower voltage means slower pump). As cars get older, just like the rest of us, it takes longer to get to pressure. Changing the brake fluid is always a good idea, and it may speed up the pressurizing of the system some. But as long as the lights go out after about 30-40 seconds, it's really nothing to worry about. Taking longer for the lights to go out is a sign of aging, but not a sign of impending failure.
Never drive away until both the lights go out.
, Thu, 3 May 2001 09:57:40, Thu, 3 May 2001 11:20:43 <-- Viewing This Message, Fri, 4 May 2001 09:47:50
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