A. It is here that the air is stored that is admitted to the brake
cylinder when the brake is applied; thus, each car carries its own brake
power.

11. Q. What is the purpose of the brake cylinder?

A. It is here where the power of the compressed air is converted into
work by forcing the brake piston out, moving the brake levers, rods and
brake beams, forcing the brake shoes against the wheels, applying the
brake.

12. Q. What is the purpose of the brake pipe and angle cocks?

A. It is through the brake pipe that all brakes in the train are placed
into communication with the brake valve on the locomotive; and through
the brake pipe, air from the main reservoir flows to the triple valves
and auxiliary reservoirs on the different cars. The angle cocks are for
the purpose of opening and closing the ends of the brake pipe.

13. Q. What is the purpose of the cut-out cock?

A. To cut out any brake that is not in operating condition.

14. Q. How is a brake cut out?

A. By closing the cut-out cock in the cross-over pipe and bleeding the
auxiliary reservoir.

15. Q. How would you bleed an auxiliary reservoir?