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1. The battery warning. This is indicative of a weak battery and if your battery is 3 years old or more I would replace it.
2. If you have a weak battery this can trigger other warning lights in the vehicle, typically the ABS warning but sometimes other warning lights as well depending on the electronic features in the car. If you replace the battery this should correct the battery warning and most likely the ABS warning if both of these warnings appeared at the same time.
Normally, once the ABS warning is displayed the anti lock braking system(ABS) will be shut down. Whilst your braking will be normal, if you brake too hard and lock up your wheels on a slippery road there is no ABS assist to prevent the brake lock up which you have when the system is working.
3. If the alternator on the engine is not generating sufficient power and thus not charging the battery at all, or very little, you will likely get a battery warning light. I don't know if your 1999 vehicle has a warning light to indicate a faulty alternator or not.
4. Check Engine Light.
You suggested the CE warning has been showing up for a few days and before the battery and ABS warnings popped up.
The CE warning can be caused by dozens of different engine issues.
The vehicle needs to be scanned with the appropriate scan tool to see what fault codes the onboard computer is generating because if you have a CE warning light there will be fault codes generated 99% of the time.
Once these fault codes have been pulled the mechanic can start to diagnose the cause of the problem or problems. Each engine fault code your car's computer is generating can be caused by different types of problems so it is important that they diagnose the issues correctly. Otherwise your Check Engine light will remain on as long as the causes are not identified and fixed.
"Is it possible if I bleed all four brakes they might shut off?"
If you bleed the brakes all you will do is remove any air in the brake lines and replace the brake fluid with new fluid. Do this in any event if the brake fluid is 2 yrs old or more.
This will have no affect on the ABS warning light and when the light is displayed the ABS has turned off because there is a problem with the ABS. You will not get it back on until the cause is determined and fixed which may be just a failed wheel speed sensor.
The brake warning has probably been triggered by the same failure that has caused the ABS warning light (since they came on together and bleeding the brakes should make no difference).
If the car sat for 2 months, no doubt the battery went flat. You have not mentioned anything about the battery but if your battery is in poor shape this can trigger warning lights in many cars especially the ABS (and stability control systems).
The best option is to have the vehicle scanned for fault codes that have been generated and there will be one or 2 if these warning lights are displayed. Scanning the ABS for codes will show up one or more issues and you can trace the problem from there. I think you will find the brake warning and ABS warning have been caused by the same fault.
In any event make sure you check the brake fluid level in the car and look for any external leaks of fluid that may have developed. Check the operation of your brakes to ensure they are working normally and that the brake pedal is not slowly dropping to the floor when you continue to apply pressure. Bleed the brakes if the brake fluid is 2 yrs old or more.
The warning light indicates there is a problem with the ABS which, if needed (as in a skid), will prevent the ABS from properly funtioning. This usually does not affect the routine operation of the vehicle. Should have it serviced -- a common cause for this warning light is a malfunctioning wheel sensor -- but there are other causes as well.
brake pulsation is caused by warped brake rotors, not sure the ABS light and the pulsation are related, The ABS warning light requires a scanner to be connected and to read the fault code that is stored when the ABS warning light is turned on.
check your brake fluid level, brake system, wheel sensors. Dirty wheel sensors usually cause the ABS light to come on. As for the brake warning light, it may be low on fluid (possible leak) or faulty E-brake switch.
BMW MODELS AFFECTED: All with ABS FAULT: ABS warning light comes on intermittently. Normal troubleshooting procedures find no defect. Possible Cause: If car has recently had two new tires, or snow tires put on. Sometimes when the car is driven over 50 MPH. Solution: Check all four tires on the car, make sure they are the same brand, style, and size. Check if any of the new tires have substantially more tread than the rest. These differences may cause enough variance in rolling diameters to confuse the ABS control unit, which in turn, gives a false signal to the ABS warning light. If that is not the issue, it is most likely the ABS control module failing.