ASE A5 Practice Test — Free Brakes Questions (2026)
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.
Take the A5 practice test
Eight verified A5 questions in the real exam’s symptom-to-cause format. Answer one and the reasoning appears. No account, no email.
Real ASE-format questions with explained answers. Pick an answer and the reasoning appears — including why the tempting wrong choice fails. Nothing to sign up for.
- 1
A passive (variable reluctance) wheel speed sensor generates its signal by:
- 2
A disc brake produces a constant pulsation in the pedal during braking that increases with speed. The MOST likely cause is:
- 3
In a typical leading/trailing or duo-servo drum brake, the term 'self-energizing' (servo action) means:
- 4
A vehicle has a slowly sinking brake pedal when held under steady foot pressure, yet no external fluid leaks are found. The MOST likely cause is:
- 5
When checking a serviceable (adjustable) tapered wheel bearing, the technician should set preload by:
- 6
To test a vacuum booster's basic operation: with the engine OFF, pump the brake pedal several times to deplete reserve vacuum, hold the pedal down, then start the engine. A good booster will:
- 7
An active wheel speed sensor differs from a passive sensor in that an active sensor:
- 8
Disc thickness variation (DTV) is best measured with a:
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 or the brake hydraulic components 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 (see ABS wheel-speed components) before condemning the modulator.
A worked question
A brake flex hose on the right front is checked while a helper holds the brake pedal. The caliper on that corner drags and releases very slowly after the pedal is released. Technician A says the flex hose is collapsing internally and acting as a one-way valve. Technician B says the caliper piston is seized. Who is right?
- A Technician A only✓ correct
- B Technician B only
- C Both A and B
- D Neither
Read the release: the pedal lets up but the corner stays dragged and releases slowly. That timing — pressure in easily, pressure trapped on release — is a collapsed flex hose acting as a one-way valve. It’s a classic A5 trap: the swollen hose is the cause, and it’s in the task list under hydraulic-system diagnosis. Technician A is right.
Exam trap: A seized caliper piston causes drag and heat but typically stays consistent — the pedal doesn't release the pressure normally. A swollen hose acts as a check valve: pressure gets in during apply but can't fully vent back, so the corner stays dragged and releases slowly. That delay pattern points to the hose, not the piston.
Quick check
A brake pedal slowly sinks to the floor while held at a stop with no external leak. The most likely cause is:
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. Next up: the A4 Suspension & Steering practice test or the A6 Electrical practice test, or browse all ASE practice tests.