Air Brakes Flashcards
What do air brake chambers do
Convert compressed air into mechanical energy
What do slack adjusters do
Adjust brakes to compensate for lining wear
What does a treadle valve do
Controls the air pressure delivered to brake chambers
What happens when the treadle valve is pressed
Force is transmitted to pressure regulating spring and diaphragm, and are moved downward and close exhaust valve
What is a treadle valve also known as
Brake pedal
What does a trailer control valve do
Allows operator to control trailering load at all times
What is a trailer control valve
Hand turned valve that acts like a treadle valve
What does a brake quick release valve do
Exhausts brake chamber PSI and speeds up brake release by reducing air travel distance
What does a Tractor protection valve do
Protects air brake system under trailer brake away and severe air leaks
Trailer protection valve has how many positions
2:
- normal
- emergency
What does the normal position in trailer protection valve do
Allows trailer and tractor to brake normally
What does the emergency position on a trailer protection valve do
Closes off trailer air brakes
What lines flow from trailer protection valve
Trailer service and emergency
What does the relay emergency valve do
Automatically applies trailer brakes when emergency line is broken
Why are check valves installed on air lines
To prevent loss of air during line rupture
