However, vehicles with 3-sensor EBC4 systems experience the problem when traveling from a high coefficient of friction surface to one with a low coefficient of friction while the ABS is operating. To remedy the problem GM will reconfigure the software or algorithms in the ABS computer. Suburbans is still open. However, it is expected that GM will offer a similar Special Policy to the one offered on its smaller SUVs and pickup trucks. Other factors affecting ABS performance include the condition of the tires, shocks, and suspension components, as well as their design.
ABS interprets lockup and releases the brakes.
The more the tire is off the ground, the more the brakes will release, thus extending the stopping distance. Forensic mechanic Forest Folck believes there are other problems causing ABS failure incidents in GM light trucks. Folck, who is an expert in a number of GM ABS cases, has seen sensor failure and sensor errors from contamination, particularly in the EBC4 3-sensor system. The single rear sensor located in the transmission is frequently contaminated with metal shavings commonly found in the fluid. When the error clears, the ABS valves open, causing the pedal to go down before the system repressurizes, extending stopping distances and likely affecting drivers' reactions.