Air Brake Relay Quiz

What is the function of the air compressor in the air braking system?

• Exhausts the air from the system

• Applies the brakes

• Controls the driver's commands

• Supplies compressed air to the reservoir

What is the purpose of the foot control valve in the air braking system?

• Controls the air to the service chambers

• Exhausts the air from the system

• Releases the park brake

• Supplies air to the secondary chambers

Why is brake lag a problem in larger commercial vehicles?

• It causes the brakes to apply and release with a delay

• It causes the brakes to release too slowly

• It has no effect on the braking system

• It causes the brakes to apply too quickly

How does the relay minimize brake lag in the air braking system?

• By increasing the size of the piping

• By decreasing the size of the reservoir

• By increasing the distance between the foot control valve and the relay

• By using small pipes for quicker signal transmission

What is the purpose of the supply port on the relay valve?

• To deliver air to the rear service brakes

• To supply the relay with constant compressed air

• To exhaust the air from the system

• To receive the signal from the foot brake valve

What happens when the driver applies more force to the brake pedal?

• The relay valve goes into the 'OFF' position

• The relay valve goes into the 'HOLD' position

• The relay valve stops functioning

• The relay valve goes into the 'ON' position

What happens when the driver removes some force from the brake pedal, but not all of it?

• The relay valve goes into the 'ON' position

• The relay valve goes into the 'OFF' position

• The relay valve goes into the 'HOLD' position

• The relay valve stops functioning

What is the purpose of the exhaust valve on the relay valve?

• To exhaust air from the brake chambers

• To receive the signal from the foot brake valve

• To deliver air to the rear service brakes

• To exhaust the air from the system

What position is the relay valve in when the brakes are off?

• OFF

• HOLD

• EXHAUST

• ON

What is the main function of the relay valve in the air braking system?

• To exhaust the air from the system

• To minimize brake lag and speed up the application and release of the brakes

• To control the driver's commands

• To supply compressed air to the reservoir