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?
A. By holding open the release valve on the reservoir until all air has escaped.
16. Q. How would you bleed off a stuck brake?
A. By holding open the auxiliary release valve until the brake piston starts to move toward release position.