RE: ABS light
The ABS light taking a few seconds to turn out is normal. It doesn't go out until there is sufficient brake pressure if I remeber correctly, and I think it can be on for a long time before it is considered a problem. That may be one way to tell that your system could be going bad, if it takes longer for the pump to bring up pressure before the light will go out, but I wouldn't count on just that as an indicator. Temperature can affect that, and how long your car has been sitting since last driven.
The best way to see if your accumulator is within spec is to listen for the pump that pressurizes it and count how many brake applications you get before it comes on again. I think normal is considerd 3-5 brake applications. It can be very hard to hear, it's not very loud. It just makes a low hum/buzz type of sound for a few seconds each time it comes on. It may take a few tries for you to hear it while driving, with the radio off, windows closed, and AC off you may have a better chance of hearing it. You may want to just park in your driveway, pump the brakes, and then get an idea of what the pump sounds like when it comes on. I'm not sure if counting how many times you can pump the brake before it comes on in the driveway is the same as driving and braking to count the number.
Bill
98 Mark VIII LSC - Silver - 59K mi
86 Mark VII LSC - Black - 242K mi
More Info In Profile - Member Since Dec 2000