Newbie with air brake question

[karitoki]

I’m Confused...my Air Brake coach doesn’t have a brake fluid reservoir.

Your air lines go to the brake servos. I guess you could have a different type of metering device. My treadle valve is all air. Maybe you have a hydraulic actuation of your air trade valve. I’ve not seen this before,,,but I’m not a chassis expert.

The plot thickens. I spoke to a mechanic and he said the reservoir could be for the hydraulic jacks. I'm going to spend some time under the bus this afternoon tracing things out.