ASE T4 Brakes (Medium Heavy Truck) Practice Questions - ASE T4 - Brakes (Medium Heavy Truck) Certification Exam - ASE T4 Brakes (Medium Heavy Truck) Practice Questions - ASE T4 - Brakes (Medium Heavy Truck) Certification Exam

Question 1

On a typical heavy-truck air brake system, what is the primary job of the air compressor governor?

It meters air to the front and rear circuits in a fixed ratio It limits the maximum service brake application pressure delivered to the brake chambers It cycles the compressor between loaded (building air) and unloaded modes to maintain reservoir pressure within a set range It controls the spring brake hold-off pressure

Correct Answer:

It cycles the compressor between loaded (building air) and unloaded modes to maintain reservoir pressure within a set range

Question 2

Typical air brake governor cut-out (compressor unload) pressure on a heavy truck is closest to which range?

160 to 175 psi 60 to 75 psi 85 to 95 psi 120 to 135 psi

Correct Answer:

120 to 135 psi

Question 3

The first (supply) reservoir downstream of the compressor on a heavy truck is commonly called the wet tank. Why is it called wet?

It is filled with brake fluid to lubricate valves It collects condensed water and oil that fall out of the compressed air before it reaches the service tanks It is the only tank pressurized when the engine is off It supplies windshield washer fluid to the system

Correct Answer:

It collects condensed water and oil that fall out of the compressed air before it reaches the service tanks

Question 4

An air dryer with a desiccant cartridge is installed on a tractor. What is its main purpose?

To remove moisture and oil from the compressed air before it enters the reservoirs To regulate brake application pressure To warm the air to prevent valve freeze-up only To increase compressor output pressure

Correct Answer:

To remove moisture and oil from the compressed air before it enters the reservoirs

Question 5

A technician finds excessive oil being expelled from the air dryer purge valve and oil contamination in the reservoirs. Which is the MOST likely root cause?

A leaking front brake chamber diaphragm An over-adjusted slack adjuster A worn or failing air compressor passing oil into the discharge air A stuck-open quick-release valve

Correct Answer:

A worn or failing air compressor passing oil into the discharge air

Exam overview

About this Exam

Prepare with the ASE T4 Brakes (Medium Heavy Truck) Practice Questions - ASE T4 - Brakes (Medium Heavy Truck) Certification Exam practice quiz. This question bank includes 100 questions covering brake, truck, valve, brakes, and spring. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ASE T4 Brakes (Medium Heavy Truck) Practice Questions - ASE T4 - Brakes (Medium Heavy Truck) Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on brake, truck, valve, brakes, and spring. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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About this Exam

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ASE T4 Brakes (Medium Heavy Truck) Practice Questions - ASE T4 - Brakes (Medium Heavy Truck) Certification Exam

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