1997 blazer..Brake booster gone bad?
A friend said her brake pedal was hard to push down. I went over and replaced the check valve on the brake booster, but it was fine. Pushing on the brake which is a little harder than normal would stop the car, but feel like the brakes weren't grabbing enough to bring it to a stop.
When pushing on the brake you hear a noise like something is loosing air (noise is coming from behind the brake pedal).
I am going in the right direction with replacing the brake booster?