Air Brake Systems Overview

Questions and Answers

What system controls the front brakes?

Primary tank

Brake valve

Air compressor

Secondary system (correct)

What does the primary tank supply air to?

The rear brakes and the park/emergency brakes

What is another name for the supply tank?

Wet tank

What is the function of the air compressor?

To produce air for the brake system Signup and view all the answers

What is the role of the brake valve?

To supply the correct amount of air pressure to other valves and brake chambers Signup and view all the answers

What does the ABS modulator valve do?

Regulates air pressure to each ABS controlled brake Signup and view all the answers

The safety valve opens if the system reaches 200 psi.

False Signup and view all the answers

What is the purpose of the air dryer?

To remove moisture and clean and cool the air Signup and view all the answers

What is the function of the quick release valve?

To speed up the release of air from the brake chambers Signup and view all the answers

When is the service brake chamber used?

When only the application of service brake air is required on an axle or to park Signup and view all the answers

What is the MV3 valve used for?

For parking, tractor protection control, trailer park, and other functions Signup and view all the answers

What mechanism does the spring brake use to apply the brakes?

A large coil spring Signup and view all the answers

What does the tractor protection valve protect against?

Air loss from the trailer Signup and view all the answers

What is the purpose of the double check valve?

To direct a flow of air into a common line from either of two sources, whichever is at a higher pressure Signup and view all the answers

What does the low pressure indicator do?

Gives an automatic warning when air pressure is below the safe minimum level Signup and view all the answers

What does the governor control?

Compressor output by monitoring the air pressure in the supply reservoir Signup and view all the answers

What is the primary benefit of using a relay valve?

Delivers high capacity of air needed for braking directly Signup and view all the answers

What system does the secondary tank supply air to?

The front brakes Signup and view all the answers

The one way check valve allows air to flow in both directions.

False Signup and view all the answers

Study Notes

Air Brake Components and Functions

Secondary System: Controls the front brakes.
Primary Tank: Supplies air to the rear brakes and operates the parking/emergency brake.
Wet / Supply Tank: First tank for compressed air, collects moisture and oil, hence the term "wet" tank.
Air Compressor: Generates compressed air for the brake system, powered by the engine; it increases pressure for stored energy.
Brake Valve (Foot/Treadle Valve): Central control point that supplies the appropriate air pressure to valves and brake chambers for the secondary brake system.
ABS Modulator Valve: Regulates air pressure to ABS-controlled brakes; modulates air during ABS operation to prevent wheel lockup.
Safety Valve: Activates when system pressure exceeds 150 psi to protect from over-pressurization.
Air Dryer: Removes moisture, cleans, and cools the compressed air to prevent damage to components.
Quick Release Valve: Enhances the speed of air release from brake chambers for quicker brake release.
Service Brake Chamber: Engages service brake air for axle operation or parking.
MV3 Valve: Dash-mounted push-pull valve managing functions such as parking, trailer protection, and air reservoir connections.
Spring Brake: Utilizes a large coil spring to apply brakes, provides holding force without air application.
Tractor Protection Valve: Safeguards the tractor by managing air loss in the trailer, ensures operational signals are maintained.
Double Check Valve: Directs air flow into a common line from two sources, selecting whichever has higher pressure.
Air Gauge Low Pressure Switch: Safety indicator warns the driver of unsafe low air pressure, often activates a buzzer or warning light.
Governor: Regulates compressor output by monitoring supply reservoir pressure, controlling compressor activation.
Relay Valve: Delivers high capacity air directly to brakes, reducing travel time from brake valve to brake assembly.
One Way Check Valve: Allows airflow in one direction only, preventing backflow.

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Description

This quiz covers key concepts related to air brake systems, including various components such as the secondary system, primary tank, and wet/supply tank. Test your knowledge of how these systems function and their roles in vehicle braking. Perfect for studying air brake schematics and their applications.