Air Brakes #2 Flashcards
What should be inspected regarding brake air pot brackets?
Inspect brake air pot brackets
Ensures that the brackets are secure and functioning properly.
What is the acceptable axel play measurement?
0.005
Refers to the outside slack adjuster shins measurement.
What is the range for yoke engagement measurements?
1/2 in - 1/8 in
Specifies the required yoke engagement distance.
What does ABS stand for in the context of brake systems?
Anti-Lock Brake System
This is a safety system designed to prevent wheel lock-up during braking.
What components are part of the ABS system?
- 4 wheel sensors
- modulator valves
- Wheel speed sensors
- Tone rings
These components work together to monitor and control braking.
How do wheel speed sensors and tone rings work together?
They form a sine wave signal for the ECM
This signal helps in monitoring the speed of the wheels.
What does the ECM do with the sine wave signal from the sensors?
It sends a signal to the air valve
This action prevents wheel lock-up during braking.
What is the function of relay valves on drive axles in an ABS?
They are used to distribute air pressure
This helps in effective braking across the drive axles.
From where does the air supply come in the braking system?
From the treadle valve
This valve controls the flow of air in the braking system.
What happens if the gap is too big in the ABS system?
ABS light turns on
Indicates a potential malfunction in the braking system.
What is the purpose of the tone ring on the rear of the hub?
It connects to the sensor on the axle
This setup helps in monitoring wheel speed.
What is the measurement range for spinning the tone ring?
0.001 - 0.005
This is the required clearance for proper operation.
What action is taken if the road is slippery in terms of braking?
Slight pressure is applied on one side
This technique helps to prevent wheel spin.
What does derating engine power signify?
Reducing engine power output
This can be a safety feature in certain driving conditions.
What is the volume of air resivoirs in relation to air pot size?
12x size of air pot
Specifies the capacity of the air pot for effective functioning.
