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

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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

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