Update. I took the bus to my mechanic. It turns out I had 3 bad ABS valves. He said 2 of them were cracked. So we replaced all 4. I havenít seen um yet but I will when I pick up the bus.
Apparently I got the diamond studded gold plated ones bc they cost $425 EACH! The misc fittings and labor costs were more than fair price IMO.
The brake chambers were fine.
Another good reason to get an expert to look at things. I knew nothing of air brakes bf this week. Brakes are not for the inexperienced dyi guy like myself.
Iíll send pic of gold plated parts next post.