It is a calibration code, I know that much.
Is it for California maybe? And would that calibration code still run the same as the other one?
I know that my cars have 718-b codes in the door jamb.

What am I looking for?Unbolt the master, pull it back a bit, and see if the master is bad.
What am I looking for?
Just the master or the booster also?
same, my cars brakes have always worked fine, but the pedal has had some squish to them at the top of the travel, although the hiss so I will check that out in the springI've always thought my brakes were kinda soft, but everyone (mechanics) that drove it said they were fine. She brakes great, just the first 1/2" or so seems soft to me. I'll look it over again this weekend.
Are you four wheel disc or disc/drum? Rear drum adjustment can make a pretty big difference in pedal feel. If you are rear drum, it might be worth pulling the rear wheels and seeing where they are at. It doesn't seem like anybody has made a set of properly adjusting drums in about 50 years. I used to constantly have to adjust the rears on my old '92. Same for my Saturns.same, my cars brakes have always worked fine, but the pedal has had some squish to them at the top of the travel, although the hiss so I will check that out in the spring
I replaced all 4 calipers (PBR up front) and braided hoses years ago and there was no difference.

I’m the weird one that actually like drums.
