As a child, I used to love watching Shirley Temple's movies and I was drawn to reading her autobiography, Child Star. This was one of the best Hollywood autobiographies I have ever read because of the way Shirley gave a complete overview of her life.
Definition of engineer's brake valve. : a valve in the cab of a locomotive for operating the air brake.
This tool attaches to the bleeder valve of each individual brake caliper or wheel cylinder, and when the valve is turned, suction pulls the fluid from the brake system, preventing air from entering. Once the extracted fluid is completely clean and new, the valve is closed. This is repeated for each wheel.