* Faulty Wheel Speed Sensor(s): This is the most common culprit. These sensors monitor wheel rotation speed. If a sensor is malfunctioning (dirty, damaged, or failing), it can send incorrect signals to the ABS module, causing it to think a wheel is locking up even when it isn't, thus activating the ABS.
* Faulty ABS Module: The module is the "brain" of the ABS system. Internal failures within the module can lead to erratic ABS activation. This is a more serious and expensive problem.
* Low Brake Fluid: While less likely to cause ABS activation during slow stops specifically, very low brake fluid can affect sensor readings and potentially trigger the ABS prematurely. Check your fluid level.
* Wiring Issues: Damaged or corroded wiring connected to the wheel speed sensors or the ABS module can lead to faulty signals and incorrect ABS activation.
* Internal ABS Hydraulic Component Malfunction: Less common, but problems within the hydraulic components of the ABS system (pump, valves) could cause unintended activation.
* ABS Control Module Power Supply Problem: Intermittent power to the ABS module can cause erratic behavior.
What to do:
1. Check Brake Fluid: Make sure your brake fluid level is correct. Low fluid indicates a potential leak somewhere in the braking system which needs immediate attention.
2. Have it Diagnosed: The most important step is to take your Suburban to a qualified mechanic or an automotive diagnostic center. They can use a scan tool specifically designed to read ABS codes. These codes will pinpoint the exact problem, saving you time and potentially money from unnecessary repairs. Don't attempt to fix this yourself unless you have extensive automotive electrical experience.
Ignoring the problem could lead to reduced braking performance in an emergency situation, so addressing it promptly is crucial.
