ASE S4 Brakes (School Bus) Practice Questions - ASE S4 - Brakes (School Bus) Certification Exam - ASE S4 Brakes (School Bus) Practice Questions - ASE S4

Question 1

A school bus air system builds pressure slowly. The compressor is engaging normally and the governor cuts out at the correct pressure. Which condition is the MOST likely cause of slow build-up?

A restricted or contaminated air dryer or excessive system leakage A governor cut-out setting that is set too low An unloader that is stuck in the loaded position A relay valve with a defective exhaust port

Correct Answer:

A restricted or contaminated air dryer or excessive system leakage

Question 2

The air compressor governor on a school bus is responsible for which function?

Metering air to the front service brakes during a stop Controlling compressor loaded/unloaded operation by cycling the unloader at cut-in and cut-out pressures Protecting the secondary reservoir if the primary circuit fails Limiting brake chamber pushrod travel as linings wear

Correct Answer:

Controlling compressor loaded/unloaded operation by cycling the unloader at cut-in and cut-out pressures

Question 3

Technician A says the air dryer removes moisture and some oil from compressed air before it reaches the reservoirs. Technician B says a saturated desiccant cartridge can allow water to collect in the reservoirs. Who is correct?

A only B only Both A and B Neither A nor B

Correct Answer:

Both A and B

Question 4

During an air dryer service, the technician finds the purge valve is not exhausting at governor cut-out. What is the MOST likely result?

The compressor will fail to unload and overpressurize the system The trailer supply line will lose pressure during braking The spring brakes will apply with the parking control released Moisture and oil are not expelled, so contamination builds in the dryer and reservoirs

Correct Answer:

Moisture and oil are not expelled, so contamination builds in the dryer and reservoirs

Question 5

What is the primary purpose of the one-way check valves located between the wet reservoir and the primary and secondary reservoirs?

To prevent loss of stored air from one reservoir if another reservoir or the supply line fails To regulate the governor cut-in and cut-out pressures To exhaust moisture automatically from the wet tank To balance pressure between the front and rear brake circuits during a stop

Correct Answer:

To prevent loss of stored air from one reservoir if another reservoir or the supply line fails

Exam overview

About this Exam

Prepare with the ASE S4 Brakes (School Bus) Practice Questions - ASE S4 - Brakes (School Bus) Certification Exam practice quiz. This question bank includes 100 questions covering brake, school, technician, says, and pressure. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ASE S4 Brakes (School Bus) Practice Questions - ASE S4 - Brakes (School Bus) Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on brake, school, technician, says, and pressure. 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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ASE S4 Brakes (School Bus) Practice Questions - ASE S4 - Brakes (School Bus) Certification Exam

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