Air Brake System Vocabulary

Question 1

Air Dryer Integrated System (AD-IS)

Answer 1

Air dyer built into supply reservoir, contains additional valves

Question 2

Anti compounding valve

Answer 2

Prevents simultaneous application of service and spring brakes

Question 3

Bob tailing

Answer 3

A tractor with a trailer

Question 4

Crack pressure

Answer 4

The air signal pressure required to begin delivery of air pressure from a relay valve

Question 5

Inlet pressure regulating valve

Answer 5

Regulates maximum air pressure supplied to the air compressor from the turbocharger

Question 6

Inversion valve

Answer 6

Spring brake relay valve

Air pressure closes

Question 7

Limiter valve

Answer 7

Increase front brake application pressure when tractor is not towing a trailer

Question 8

Pneumatic balance

Answer 8

All brakes have the same pressure

Question 9

Pneumatic imbalance

Answer 9

Incorrect timing of brake application air pressure

Question 10

Pressure protection valve

Answer 10

Control the charging of air system reservoirs draining out of the reservoir

Question 11

Proportional valve

Answer 11

Changes service brake application pressure relative to signal pressure form the foot valve

Question 12

Relay valve

Answer 12

Speeds up air flow during brake application

Question 13

Stray relief valve

Answer 13

Valve located in the supply tank; used to prevent over pressurization of the tank