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First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0290 or C0292
Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit
If they all come on at the same time, chances are its a problem the engine computer has found. The wrench is a warning light for the engine and transmission, the ABS and traction control involve both the drivetrain as well as the brakes. So if a problem pops up in one system the computer knocks out the others too. Have the main computer checked for trouble codes and go from there.
OK, if the ABS light goes on, many times it is due to a dirty or bad wheel speed sensor. Don't worry too much, because if the ABS light is on, standard braking will work. If you don't notice any pulling to one side or the other, and you can come to a full and complete stop without skidding, it's probably ok, until you can have the ABS system repaired at your convenience.
Turning the car off will reset the ABS system on Chevrolet Cars and Light trucks. But, if the ABS light comes back on, it probably means it has lost a signal from one or more of the wheel speed sensors.
Sometimes a wheel hub assembly with an ABS sensor on it will be necessary to repair the problem on many late model vehicles.
when the ABS light comes on you will not hear or feel anything cause soon as the ABS light comes on the ABS is disabled
sounds like it is weather related (rain,snow)
i would check both rear wheel speed sensor harnesses for water intrusion if you see any corrosion (green) on the terminals replace both the hub and harness
if there is no corrosion then check resistance of the sensor also check for a short to ground
if that is ok then put some dielectric lube on the wheel speed sensor terminals and clear the codes and see what happens
intermittent problems can be hard to find
hope this helps
That "grindy" feeling is when the ABS kicks in. It's only suppose to activate when you slam on the brakes and the wheels would normally lock. Instead, ABS will very quickly pump the brakes on and off, to prevent the wheels from locking (making a giant skid mark) and stopping the car more effectively. Generally this only happens if you slam on the brakes or loose traction due to rain or snow while braking. If this is happening often and the brake light is on, on the dash, then you need to get this checked out by a qualified mechanic ASAP.
You are loosing power Because the Computer is Shifting the Transmission in to Traction Low to get out of the Situation. The ABS Light is coming on due to Wheel spin. It is telling you that there has been an Unexpected Incident and to slow down.