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"ani brake light"??? Do you mean Antilock Brake light? If the antilock brake warning lamp is illuminating while driving under normal driving conditions, then you probably have a malfunction in your antilock brake system. You must scan your antilock brake control module to find out why it has been illuminating the light. Wheel speed sensor malfunctions are a common cause of the symptoms you are describing, but you cannot be sure if that is what is causing it, or which one is causing the problem without scanning the controller and performing proper diagnosis.
You have a wheel speed sensor that is not working correctly. The ABS computer is losing the signal from the wheel speed sensor and interprets this as a wheel locking up, so it is going into antilock mode. When it does this on dry pavement when it is obvious that there is no wheel actually locking up it is called "false Antilock Mode" or "Overactive Antilock Mode". This is a pretty common problem on several vehicles.
The system on your Blazer uses wheel speed sensors which are an integral part of the front wheel bearing and hub assembly to determine wheel speed for the front wheels. It uses the Vehicle Speed Sensor (VSS) to determine rear wheel lock-up. The VSS data is shared between the Body Control Module (BCM), the Vehicle Control Module (VCM), The Powertrain Control Module (PCM), the Transfer Case Control Module (TCCM) and the Electronic Brake Control Module (EBCM - AKA "Antilock Module"). The problem is MOST LIKELY being caused by a front wheel bearing being loose (pretty common) which will require replacement of the front wheel bearing and hub assembly. However, it can also be caused by the VSS or a breakdown in communication between any of the modules that share the VSS data.
If you have either of the front wheel bearings making noise (growling or whining) then that is almost positively the cause of your problem. However, if it cannot be determined this way, the computer network will need to be scanned to find out which it is.
check for a bad hub bearing play in the bearing will cause a misalignment with the wheel speed sensor...check for a broken tone ring on the cv shaft....an have codes pulled to see if u have lost wheel speed sensor signal..move service stations can do this at a reasonable cost.... as for it being major it is not the brakes will still function but ur antilock brakes wont work
The only way to know for sure why your Antilock Brake light is on is to scanyour Antilock Brake Module and retrieve the fault code that has set and turned the light on. If you have not accessed the Brake Control Module and checked the data, I don't know how you could have possibly "Checked the sensors". This data MUST be accessed to see if the module is recieving the signal from the sensors in order to know if the sensors are good. If you have done this, then you should have also recieved the fault code to let you know what the problem is. You cannot scan your vehicle with a generic OBD code reader to get ABS information. You must have a scanner that has a data interface for accessing the Control Area Network (CAN) on your vehicle.
It sounds like "False Antilock Mode" to me. Your Antilock Brake Control Module "thinks" that you have a wheel locking up. This is probably caused by a bad wheel sensor. You need to scan the module to find out which one.
you may have a loose wheel bearing & warped brake disc!
most people not even most mechanics dont realise that a loose wheel bearing can prevent the brakes from being blead up due to the movemnt !!