Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
From the symptoms you have described, it sounds like the valve in the power booster may be bad. Before replacing the power booster, disconnect the brake pedal from the rod going to the booster and start the engine. Make sure that rod does not have to be partially depressed to connect it to the brake pedal arm. If alignment is correct, replace the booster.
When you go to reinstall the rod to the pedal arm, does it align perfectly or do you have to push the rod in to get it to align?
The problem is in the assist valve inside the booster. Replacing the booster should fix your problem.
Glad I could help. Please let me know if I can assist further.