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ASE School Bus

S3 School Bus — Drive Train — practice test

Studying for S3 (School Bus — Drive Train)? Overhaul Prep has 175 verified S3 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

175S3 questions
100%with explanations
9,711questions in total
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Sample S3 questions

Straight from the bank — answers highlighted, with the explanation underneath.

On a heavy-duty pull-type clutch equipped with a clutch brake, the clutch brake should be engaged only when:

  1. Making upshifts at highway speed
  2. Shifting into a starting gear (first or reverse) while the bus is stopped
  3. Downshifting under load on a grade
  4. Any time the clutch pedal is depressed
WhyThe clutch brake stops the transmission input/countershaft so a non-synchronized starting gear can be selected from a standstill; it is applied only in the last inch of pedal travel while stopped. Using it while rolling (up/downshifts) burns it up.

Technician A says too little ring-and-pinion backlash can cause overheating and gear noise. Technician B says too much backlash can cause a clunk on acceleration/deceleration and an improper tooth contact. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyInsufficient backlash removes needed running clearance (bind, heat, noise); excessive backlash lets the teeth hammer (clunk) and shifts the contact pattern; both are wrong conditions.

A drive axle whines or howls on acceleration (drive) but is noticeably quieter on coast. The MOST likely cause is:

  1. A worn wheel bearing
  2. Incorrect or worn ring-and-pinion tooth contact on the drive side
  3. An unbalanced driveshaft
  4. Low engine oil
WhyGear noise that changes with load, a howl on drive that quiets on coast, points to a ring-and-pinion mesh problem (wrong pattern/backlash or wear). Bearing noise is usually constant and speed-related.

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