“The easiest way to spot the air compressor is to look for the air governor. The governor is usually silver cylinder with a black cap on top.” I don’t see a silver cylinder with a black cap on top in this illustration.
nice video that goes thru most of the non-mechanic subject of air brakes. Late 1990's all trucks had ABS on them , you should drain your air reserve tanks every night, uses wheel chokes instead of parking brake in cold weather....etc