ASE A5 Brakes Practice Test
A5 practice should lean where the real test leans: hydraulic diagnosis and ABS, not just pad-and-rotor service. The worked questions below cover pedal-feel diagnosis, rotor pulsation, and an ABS complaint — each with the reasoning the exam rewards — then point you to free interactive practice. Use the misses to find the content area to study, not as a final grade.
What this practice covers
A5 questions concentrate on hydraulic diagnosis, disc and drum service, power assist, the brake electrical/warning circuits, and ABS. The worked questions below model the test’s symptom-to-cause format; for the full breakdown, see the A5 study guide.
Worked A5 questions
1. Sinking pedal. The brake pedal slowly sinks to the floor under steady foot pressure, and there’s no external leak or visible fluid loss. Most likely cause?
- Answer: Internal master-cylinder bypass. Fluid is leaking past the cylinder’s seals internally, so the pedal can’t hold pressure. No external leak rules out lines and calipers; the slow, steady sink is the master cylinder’s signature. Air in the system gives a spongy pedal, not a sinking one.
2. Pulsation. A customer feels a pulsation in the brake pedal during stops. What’s the most accurate cause to cite?
- Answer: Excessive rotor thickness variation. “Warped rotor” is the trap answer — ASE wants the measurable condition. Thickness variation (or excessive runout) makes the caliper clamp unevenly as the rotor turns, which you feel as pulsation. Measure it with a micrometer and dial indicator rather than guessing.
3. ABS light. The amber ABS light is on with a code for one wheel-speed sensor. The base brakes stop the car fine. What should the technician do first?
- Answer: Diagnose that wheel-speed sensor’s circuit and air gap. The base hydraulic brakes are working, so there’s no reason to bleed or replace them. The fault is in the ABS input — check the sensor, its wiring, the connector, and the air gap / tone-ring condition before condemning the modulator.
Reading your result
Misses bunched in hydraulics or ABS point straight to your study block — and those are the two areas A5 weights most, so don’t skip them. Aim for consistent 80%+ in each area across a few attempts, then start free A5 practice and review the A5 study guide for the underlying content.