The Kelsey-Hayes EBC310 ABS system, found in GM trucks from 1995 to the early 2000s, presents a unique challenge when bleeding brakes. This system, with its three sections (left-front, right-front, and rear axle), includes an Isolation valve and a Dump-Valve/Low-Pressure Accumulator in each section. The low-pressure accumulator is positioned behind the dump-valve, making it inaccessible for traditional bleeding methods.
To effectively flush fluid and air from these accumulators, cycling the ABS is necessary. The official method involves using a Tech 1 Scan Tool to command the ABS computer. However, a common workaround for those without access to this specialized tool involves driving on a gravel or snow-covered road and forcefully applying the brakes to induce wheel lockup and ABS activation.
This “shade-tree” method has significant drawbacks. First, the brakes must be functional enough for safe driving to reach a suitable road surface. Second, cycling the ABS in this manner can push air from the accumulators back into the brake lines, potentially compromising braking performance. Even if all three circuits (LF, RF, and one rear wheel) activate successfully, further bleeding is required to remove any remaining air.
While a Craftsman scan tool might offer some diagnostic capabilities, it likely lacks the specific functionality to command the ABS cycle required for bleeding this particular system. Accessing the necessary commands typically requires a more advanced scan tool with bi-directional control, such as the Tech 1 or equivalent professional-grade equipment.
Therefore, while a Craftsman scan tool might be helpful for other automotive tasks, bleeding the ABS on these GM trucks effectively requires specialized equipment designed for this purpose. The alternative method of inducing ABS activation through hard braking on loose surfaces carries risks and doesn’t guarantee complete air removal. For a safe and thorough ABS bleeding process, using the correct diagnostic tool is recommended.
