Try these procedures and let me know if they work ok.
Hydraulic Brake System Bleeding (Manual)
The time required to bleed the hydraulic system can be reduced if the master cylinder reservoir is filled with brake fluid and as much air as possible is expelled before the master cylinder is installed on the vehicle. Pumping the piston can evacuate the air from the piston cavities.
Power brakes require the vacuum reserve be depleted by applying the brakes several items with the engine off. Care must be taken to prevent brake fluid from contacting any painted surface. Use rags to catch the excess fluid.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten Tighten the brake pipe tube nut to 18 N·m (13 lb ft).
Tighten Tighten the brake caliper bleed screws to 12 N·m (106 lb in).
Antilock Brake System Automated Bleed Procedure
First perform a manual or pressure bleeding procedure. Refer to Pressure Bleeding in Hydraulic Brakes. If the desired brake pedal height results are not achieved, perform the auto bleed procedure below.
The auto bleed procedure is used on Delco Bosch 5 equipped vehicles. The procedure cycles the system valves and runs the pump in order to purge the air from the secondary circuits normally closed off during non ABS/TCS mode operation and bleeding. The auto bleed procedure is recommended when air ingestion is suspected in the secondary circuits, or when the BPMV has been replaced.
Notice: The Auto Bleed Procedure may be terminated at any time during the process by pressing the EXIT button. No further Scan Tool prompts pertaining to the Auto Bleed procedure will be given. After exiting the bleed procedure, relieve bleed pressure and disconnect bleed equipment per manufacturers instructions. Failure to properly relieve pressure may result in spilled brake fluid causing damage to components and painted surfaces.
Select the following features:
Hydraulic Brake System Bleeding (Pressure)
J 35589 Pressure Bleeding Adapter
Tighten Tighten the brake caliper bleed screw to 12 N·m (106 lb in).