RetiringColt
Registered User
Dose your booster hiss or make squeaky noises when you push the brake pedal. that's usually signs of a leaking booster. Like folks have stated above. Test systems separately. Either with vacuum or light pressure. As far as upgrading goes, a double diaphragm is probably as good as you'll get. I believe the stock booster is a double diaphragm type. There might be a triple diaphragm out there, but who knows if it would bolt up and if the supplied vacuum would be enough?