Hard to depress brake pedal
2 Answers
open your hood to see the condition of your master cylinder. Probably wouldn't hurt to check your brake fluid as well. I believe it would be DOT3 fluid if you need more brake fluid. It is a GM and I honestly don't know the make well. Probably not far off. good luck
Brake booster may also be at fault, it can draw excess vacuum stalling an engine. A bad booster can also cause a hard pedal.