2008 Cadillac STS Brake Master Cylinder Bleeder Tool

If it is determined that air was induced into the system upstream of the ABS modulator before servicing, you must perform the Antilock Brake System Automated Bleed procedure.

The procedure is to inspect the brake fluid for the following conditions, inspect the master cylinder reservoir cap diaphragm and the reservoir-to-master cylinder grommets for swelling, fill the brake master cylinder reservoir to the maximum-fill level, and pressure bleed the hydraulic brake system.

You should not allow the vehicle to be driven until it is diagnosed and repaired.

You should first perform a pressure bleed of the base brake system before performing the ABS Automated Bleed procedure.

The procedure is to raise and support the vehicle, remove all four tire and wheel assemblies, inspect the brake system for leaks and visual damage, lower the vehicle, inspect the battery state of charge, install a scan tool, turn the ignition on, with the engine off, establish communications with the ABS with the scan tool, select Special Functions, select Automated Bleed from the Special Functions menu, press the brake pedal to inspect for firmness when the desired pedal height is achieved, remove the scan tool, and install the tire and wheel assemblies.