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

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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

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