Air Brakes for Road Safety

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Questions and Answers

What indicates that a brake with an exposed pushrod is out of adjustment?

The pushrod stroke exceeds the adjustment limit of the brake chamber (correct)

The pushrod stroke is below the adjustment limit of the brake chamber

The air pressure remains constant during brake application

The pushrod angle is exactly 90 degrees

Which condition requires immediate attention when inspecting air compressor components?

Compressor operating at higher rpm

Minimal dust accumulation on the compressor

Insecure mounting bracket or fasteners (correct)

Presence of rust on the compressor casing

What is the maximum allowable air loss rate per minute for a single vehicle?

2 psi per minute

4 psi per minute

5 psi per minute

3 psi per minute (correct)

When should the air brake system not be operated due to a major defect?

Under any circumstances on a road or highway Signup and view all the answers

What air pressure range is required when measuring the applied pushrod stroke on brakes?

90 and 100 psi Signup and view all the answers

Who is authorized to perform repair and re-adjustment of air brakes?

Certified technicians Signup and view all the answers

Hydraulic brake systems primarily utilize which fluid for operation?

Brake fluid Signup and view all the answers

What does an air compressor governor typically cut-in at?

20 to 25 psi below cut-out pressure Signup and view all the answers

What happens when the brake chamber pushrod stroke exceeds the adjustment limit?

Braking ability is reduced Signup and view all the answers

How often must air brake systems comply with regulations under the Ontario Highway Traffic Act?

At all times when being driven on any road Signup and view all the answers

Why must air tanks be drained regularly?

To prevent oil and moisture buildup Signup and view all the answers

What is the primary function of the brake pedal in an air brake system?

To apply vehicle service brakes Signup and view all the answers

What does brake fade primarily result from?

High brake temperatures Signup and view all the answers

What is the consequence of cross-connecting trailer couplers or 'gladhands'?

Trailer service and spring brakes will not function correctly Signup and view all the answers

Air compressors used in braking systems can be powered using which of the following methods?

Belts and pulleys Signup and view all the answers

When conducting a vehicle inspection for the air brake system, where should the vehicle be parked?

On a level surface in a safe location Signup and view all the answers

What is a common misconception about the operation of the brake pedal in air brake systems?

It applies both service brakes and spring brakes Signup and view all the answers

What should be inspected to avoid unexpected vehicle movement during air brake system checks?

Component exhaust Signup and view all the answers

Which of the following indicates a malfunction in an anti-lock braking system (ABS)?

Waring indicator lights Signup and view all the answers

What should drivers look for when inspecting the foundation brake components?

Brake lining must be against the drum when engaged Signup and view all the answers

What must be done if a vehicle does not comply with vehicle regulations?

Both the vehicle operator and the driver may be charged Signup and view all the answers

Which component is not part of the air brake system's storage?

The brake pedal Signup and view all the answers

What happens when a spring brake chamber is disabled using a caging bolt?

The spring brake will not apply Signup and view all the answers

During an inspection, what should a driver focus on regarding brake drums and rotors?

Visible wear and structural integrity Signup and view all the answers

Study Notes

Air Brakes

Air tank drainage is important to remove moisture and oil buildup.
Air tanks help store compressed air in an air brake system.
Air brake systems are powered by compressed air.
The air brake system's pedal applies the service brakes.
Spring brake control valves are typically push/pull types located near the driver.
Trailer service and spring brakes may not function correctly when couplers are cross-connected.
Braking requires more work when the vehicle carries heavier loads.
Exceeding the adjustment limit for brake chamber pushrod stroke reduces braking ability.
Ontario's Highway Traffic Act and regulations must be followed at all times related to air brake systems.
Inspecting air brake systems should be done on a level surface in a safe location.
When inspecting foundation brakes, drivers should look for signs of wear or damage.
Brake fade occurs due to high brake temperatures.
Anti-lock braking systems (ABS) have warning indicators for malfunction detection.
Both the vehicle operator and the driver may be charged if the vehicle's brakes don't meet regulations.
Inspecting air brake systems requires caution to avoid potential hazards.
Drivers should inspect brake drums and rotors for cracks or damage.
Air compressors should be inspected for secure mounting and proper governor settings.
Air compressor governor should cut-in below the cut-out pressure setting.
The maximum allowable air loss rate for a single vehicle is 3 psi per minute.
A vehicle with a major air brake defect shouldn’t be driven on any roads or highways.
Brake adjustment for exposed pushrods can be checked by measuring the applied pushrod stroke.
The air pressure for adjusting brake pushrods should be between 90 and 100 psi.
An exposed pushrod is out of adjustment when the pushrod stroke exceeds the adjustment limit.
Air brake repair and re-adjustment should only be performed by certified technicians.
Hydraulic brake systems use brake fluid.
Air compressors are mounted directly onto the engine or by using belts and pulleys:

Other Components

Pulleys are used in mechanical systems to change the direction of force or to multiply force.
Brackets and fasteners are used to secure and support components in a system.
Sprockets are toothed wheels used with chains or belts for power transmission.
Belts and chains are used in mechanical systems for power transmission.
Alcohol evaporators are used to help prevent moisture in the air brake system from freezing.
Wedge brakes consist of brake drums and brake shoes.
Anti-lock braking systems are designed to prevent wheel lock-up during braking.

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Description

This quiz covers essential knowledge about air brake systems, focusing on their components, inspection procedures, and safety regulations. Participants will learn about moisture management, the importance of proper adjustments, and the implications of exceeding limits for brake effectiveness. It’s crucial for drivers to understand these systems to ensure road safety.