A 'stay' is the cross bar in the frame, reinforcing between 2 tubes or blades, there is a seat stay,
it is what the brake is mounted to. it is part of the frame.
and there is a chain stay, it is close to the bottom bracket shell , ahead of the wheel.
So I don't know what you are asking.
between the cantilever brakes there is a cable that pulls both inward
when the cable is pulled Up.