- Hydraulic, Power Assist, and Parking Brake Systems is 19 of 45 scored questions - the largest domain by far.
- A5 has 55 total questions (45 scored, 10 unscored), with 75 minutes to finish.
- One A5 sitting costs $96: a $62 test fee plus a one-time $34 registration fee.
- You can test before finishing your experience requirement, but certificates wait until it's verified.
Quick Facts Snapshot
This page is built as a fast reference for the days right before your test date - not a replacement for deep study. If you haven't done the foundational work yet, start with the full A5 Study Guide 2026: How to Pass on Your First Attempt and come back here to drill the numbers into memory.
| Item | Detail |
|---|---|
| Administered by | ASE (National Institute for Automotive Service Excellence) |
| Total questions | 55 (45 scored, 10 unidentified research questions) |
| Time limit | 75 minutes |
| Format | Computer-based multiple choice, Prometric centers or eligible remote proctoring |
| Fee per attempt | $62 test fee + $34 registration fee (once per order) = $96 |
| Task list | 2026 ASE Automobile Study Guide |
| Registration windows | Four quarterly windows per year |
| Scheduling deadline | 90 days from purchase to test |
| Retake wait | 30 days after a failed attempt |
| Certification length | 5 years |
Domain Weighting Cheat Sheet
A5 content is organized into four domains, and the weighting is lopsided - one area dominates the scored questions. Memorize this table before anything else.
| Domain | Weight | Approx. Scored Questions |
|---|---|---|
| Hydraulic, Power Assist, and Parking Brake Systems Diagnosis and Repair | 43% | 19 of 45 |
| Disc Brake Diagnosis and Repair | 24% | ~11 of 45 |
| Electronic Brake Control Systems (ABS, TCS, ESC) Diagnosis and Repair | 22% | ~10 of 45 |
| Drum Brake Diagnosis and Repair | 11% | ~5 of 45 |
For the full breakdown of tasks inside each area, see the A5 Exam Domains 2026: Complete Guide to All 4 Content Areas. If you're wondering whether that weighting makes A5 harder or easier than other ASE tests, the How Hard Is the A5 Exam? Complete Difficulty Guide 2026 article walks through it in detail.
Hydraulic & Power Assist Must-Knows
Since Hydraulic, Power Assist, and Parking Brake Systems Diagnosis and Repair carries 19 of 45 scored questions, it deserves more review time than the other three domains combined. Use this as your last-pass checklist.
Hydraulic, Power Assist, and Parking Brake Systems Diagnosis and Repair
Know the full hydraulic circuit from pedal to caliper/wheel cylinder, plus every assist and parking system built on top of it.
- Master cylinder diagnosis: internal/external leaks, bypass conditions, pedal feel complaints
- Brake lines and hoses: routing, flaring types, damage inspection, replacement torque specs
- Metering, proportioning, and combination valves: function and diagnostic symptoms of failure
- Bleeding and flushing procedures: manual, pressure, vacuum, and gravity methods
- Vacuum and hydro-boost power assist systems: diagnosing loss of assist
- Electronic brake servo systems and how they differ from vacuum boost
- Electronic parking brake operation, service, and release procedures
Key Takeaway
If you only have time to master one domain cold, make it this one - a weak grasp of hydraulic and power-assist fundamentals will cost you more points than any other content area on the test.
Drum, Disc, and Electronic Systems Recap
The remaining three domains are smaller but still make up more than half the scored questions combined, so don't neglect them.
Disc Brake Diagnosis and Repair (24%)
Covers rotor and caliper service, pad wear diagnosis, and noise/vibration complaints.
- Rotor measurement, machining limits, and runout diagnosis
- Caliper sticking, dragging, and knock-back issues
- Pad wear patterns tied to root causes
Electronic Brake Control Systems: ABS, TCS, ESC (22%)
Focuses on wheel speed sensor diagnostics, module communication, and system-specific fault codes.
- Wheel speed sensor signal testing and air gap issues
- ABS module and hydraulic control unit diagnosis
- Traction control and stability control fault interpretation
Drum Brake Diagnosis and Repair (11%)
Smallest domain, but still tests self-adjuster mechanisms, wheel cylinder faults, and drum measurement.
- Self-adjuster and parking brake linkage function
- Wheel cylinder leak diagnosis
- Drum machining and out-of-round limits
Format, Fees, and Scheduling Logistics
A5 is delivered at more than 450 Prometric test centers, with online remote proctored testing available if you meet eligibility requirements. Every candidate answers 55 total questions in 75 minutes - 45 of those are scored, and 10 are unscored research questions mixed in without identification, so treat every question as if it counts.
Cost mechanics are simple but worth memorizing: the test fee is $62, and there's a one-time $34 registration fee per order, bringing a single sitting to $96. If you're bundling A5 with other A-series tests in one registration window, that registration fee is charged once per order rather than once per test - plan your order accordingly. For a full pricing walkthrough, see the A5 Certification Cost 2026: Complete Pricing Breakdown guide.
Registration runs in four quarterly windows each year, and once you register you have 90 days to schedule and sit for the test. Miss that window and you'll need to re-register. If you fail, a 30-day wait applies before you can retake A5. Full scheduling mechanics, including how the quarterly windows line up with the calendar, are covered in A5 Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Question Style Cheat Notes
A5 questions are built around real-world shop scenarios rather than pure textbook recall. Expect these formats to appear repeatedly:
- Technician A/Technician B items: Two technicians propose different diagnoses or repair steps; you decide which is correct, both, or neither.
- EXCEPT questions: All answer choices are true except one - read the stem twice before selecting.
- Exhibit-based questions: DMM readings, wiring diagrams, or component illustrations you must interpret before answering.
Scoring uses a scaled cut score set by panels of working technicians rather than a fixed percentage, and results are reported as pass/fail with a preliminary result shown on-screen right after you finish. For a breakdown of exactly what that scaled score means for you, read A5 Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Because 10 of your 55 questions are unscored and unidentified, don't try to guess which ones "don't count" - answer every question with full attention as if it were scored.
The Week-Before Review Plan
If your test date is close, allocate your remaining review time proportionally to domain weight rather than evenly across all four areas - this is the single biggest efficiency gain you can make in the final stretch.
Hydraulic & Power Assist Deep Review
- Re-work master cylinder and combination valve diagnostic scenarios
- Review bleeding/flushing procedure differences
- Study electronic brake servo and electronic parking brake operation
Disc & Electronic Control Systems
- Drill rotor measurement and caliper fault scenarios
- Practice interpreting wheel speed sensor and ABS module symptoms
Drum Brakes & Weak Spots
- Quick pass on self-adjuster and wheel cylinder topics
- Revisit any domain-specific concepts still shaky from earlier practice
Format & Logistics Check
- Confirm test center or remote proctoring setup
- Review this cheat sheet's fee, timing, and question-format notes one final time
For a longer-horizon plan built around this same domain weighting, work through the A5 Study Guide 2026: How to Pass on Your First Attempt, and pair it with timed practice questions on A5 Exam Prep's practice test platform so the Technician A/B and EXCEPT formats feel familiar before test day.
Recertification and Renewal Quick Facts
Your A5 credential is valid for five years. When it's time to renew, you have two paths:
- A5R recertification test: A shorter test - 23 questions in 30 minutes - covering the same domains at a lighter depth.
- ASE Renewal App: A-series holders may alternatively maintain certification through this app instead of sitting for the A5R.
Neither path requires you to relearn the full task list from scratch, but staying current on brake technology changes between cycles is still worthwhile, especially as electronic parking brakes and stability control systems continue to evolve.
If you're still building foundational knowledge before formal study, browse A5 Training options, and if you landed here without knowing exactly what the credential covers, start with What Is A5 Certification? or the broader A5 Certification overview before diving back into domain-level review.
FAQ
A5 has 55 total questions - 45 scored plus 10 unscored research questions that aren't identified to you - and you have 75 minutes to complete the test.
A single sitting costs $96 total: a $62 test fee plus a $34 registration fee, with the registration fee charged once per order rather than per test.
Hydraulic, Power Assist, and Parking Brake Systems Diagnosis and Repair, which makes up 19 of the 45 scored questions - nearly half the scored test.
Yes. You can test before meeting the experience requirement, but you won't receive your certificate until that experience is documented and verified.
There's a mandatory 30-day wait before you're allowed to retake the same test, so plan your next registration window accordingly.