Do not pump the brakes. Just hold the brake pedal down firmly and let antilock work. A slight brake pedal pulsation might be felt or some noise noticed, but this is normal.
Chevrolet Cobalt Service & Repair Manual. Precautions
Battery Ground Cable
Prior to service, disconnect battery
ground cable and isolate as required.
Fuel System Pressure Relief
1.
Disconnect battery ground cable, isolate
as required.
2.
Install fuel pressure gauge tool N ...