My '69 F-bird has power brakes with disks up front and drums in the back. All brake components at the wheels are new as is the booster. There are no leaks so I did not run new lines. The car does stop but feels much more like manual brakes with very slight power assist. The car does have a big cam and I've been told that can effect vacuum but I've had other cars with big cams where the brakes felt OK. Not really a brake guy so I'm looking for some insight on what to check to the problem.