I test drove a Pantera for someone not long ago and there was little if any vacuum to the brake booster. The car had good brakes. The brake pedal was quite firm and the calipers seemed to be working correctly. The hydraulics seemed healthy. Without power assist it took ample effort to slow the car and it took me by surprise how much the booster helps. I think I could drive a car without power brakes but I would need to be prepared for that type of braking. It's easy to try out. Just disconnect the brake booster hose and cap off the manifold or carb.
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