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ASE Automobile

A5 Brakes — practice test

Studying for A5 (Brakes)? Overhaul Prep has 122 verified A5 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.

122A5 questions
100%with explanations
9,711questions in total
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Sample A5 questions

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

Which of the following brake fluids is silicone-based, does NOT absorb moisture, and must NOT be used in a vehicle equipped with an anti-lock brake system (ABS)?

  1. DOT 3
  2. DOT 4
  3. DOT 5
  4. DOT 5.1
WhyDOT 5 is silicone-based (non-hygroscopic), is generally not used in ABS systems, and is chemically incompatible with glycol-based fluids. DOT 3, 4, and 5.1 are all polyethylene-glycol-based and hygroscopic; DOT 5.1 is frequently confused with DOT 5 but is a glycol fluid.

Two technicians are discussing hydraulic control valves. Technician A says the metering valve delays hydraulic pressure to the front disc brakes until the rear drum shoes overcome their return springs, balancing front-to-rear application. Technician B says the proportioning valve reduces pressure to the rear brakes during hard stops to help prevent rear-wheel lockup. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyThe metering (hold-off) valve delays front application for front/rear balance, and the proportioning valve limits rear pressure to prevent premature rear-wheel lockup. Both functions are often housed together in a combination valve, so both technicians are correct.

With the engine running and steady foot pressure applied, the brake pedal slowly sinks toward the floor, yet there are no visible external fluid leaks. Which is the MOST likely cause?

  1. Internal leakage — fluid bypassing the master cylinder piston cups
  2. Air trapped in the brake lines
  3. Glazed brake linings
  4. A stuck-open metering valve
WhyA pedal that slowly sinks under steady pressure with no external leak indicates fluid is bypassing internally past the master cylinder cups, a failing master cylinder. Air causes a spongy pedal that firms up when pumped, glazing reduces friction/causes noise, and the metering valve does not cause a sinking pedal.

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