A scan tool can be a valuable asset when bleeding your brakes, especially when dealing with the ABS system. While a manual bleed might suffice for routine fluid changes or track days, a scan tool becomes essential when air enters the ABS module. This article explores how a scan tool actuates the ABS system for a thorough bleed.
Bleeding brakes with a scan tool involves a guided process displayed on the scanner’s screen. The process usually involves prompts like “Open X bleed screw and pump the brake pedal” for a specific duration. The scan tool will then instruct you when to close the bleed screw and move to the next wheel. This automated procedure ensures air is purged from the ABS module and brake lines.
For vehicles with front brakes equipped with inner and outer bleed screws, it’s recommended to utilize the scan tool’s automated procedure on the inner bleed screw first. Afterward, perform a few manual bleed cycles on the outer bleed screw to guarantee fresh fluid throughout the caliper. This can be done between automated cycles, if the scan tool allows, or after the automated bleeding process is complete.
The necessity of a scan tool for bleeding brakes depends on the situation. For routine fluid maintenance, a manual bleed following the recommended order (RR, LF, LR, RF) due to the cross-split brake system, is often sufficient. However, if air is suspected in the ABS module, a scan tool becomes crucial to effectively remove it using the specific automated bleed sequence. Using a scan tool ensures all lines and the ABS module are cleared with fresh fluid. The automated process provides a comprehensive bleed, eliminating guesswork and ensuring optimal braking performance. Using a scan tool for bleeding brakes, particularly when air is present in the ABS module, ensures a complete fluid exchange and proper system function.
