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Oregon Air Brakes Test

You'll face steep grades on I-5's Siskiyou Summit — this practice test prepares you for that reality.

118

Questions

80%

To Pass

Minutes

118 questions · 30 min time limit · 80% to pass

Opens in a practice window — choose your mode inside.

Reviewed by Jack Mahana, CDL Instructor (13+ years)

Last verified: August 2026

All questions sourced from the official Oregon CDL handbook and FMCSA regulations.

About the Oregon Air Brakes Test

Oregon's roads demand air brake know-how. You'll drive down long grades through the Cascade Range, haul logs on twisty coastal highways, and cross high desert plains. Each situation tests your brake timing and pressure management.

Wet weather is common, especially west of the Cascades. Rain reduces traction. You'll need to adjust your following distance and brake pressure. Oregon's logging trucks also create unique challenges — you must watch for sudden stops and debris.

This practice test covers the exact topics from the Oregon CDL handbook. Each question reflects real DMV scenarios. You won't see tricky wording or outdated info. We keep it focused on what you need to pass.

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Topics Covered

✓Air brake system parts — know your compressor, reservoir, and brake chambers for Oregon pre-trip inspections

✓Brake lag — critical on long downhill grades like Oregon's Santiam Pass

✓Dual air brake systems — Oregon requires you to understand both primary and secondary circuits

✓Stopping distance — wet roads on the Oregon Coast mean longer stops with air brakes

✓Low pressure warnings — you must react fast when the buzzer sounds on Oregon highways

✓Spring brakes — parking brakes that activate automatically if air pressure drops below 20 psi

Study Tips

Focus on the Oregon CDL manual's air brake section. Don't skip the diagrams. They show how air flows through the system. Practice identifying parts from memory — you'll need that for the pre-trip inspection.

Take this practice test multiple times. Each attempt shows different questions. Review every explanation, even if you get the answer right. Oregon's DMV test often asks about pressure ranges and warning devices. Know your numbers: cut-in (100 psi), cut-out (120 psi), warning buzzer (60 psi).

Set aside 30 minutes without distractions. Time yourself. Real Oregon CDL tests have a limit, and you don't want to rush.

Oregon Specific Information

You can take the Oregon CDL air brakes knowledge test at any DMV field office that offers CDL services. Many offices require an appointment — schedule online at OregonDMV.com. Walk-ins are sometimes accepted, but you'll wait longer. The test costs $10 for the air brakes endorsement added to your CDL.

If you fail, you must wait one day before retaking. You can retake up to three times in any 12-month period. After that, you'll need to wait a year or take a training course. Bring your valid Oregon driver's license and social security number.

Oregon uses a computer-based test. You'll get your score immediately. No paper or verbal tests are given. Make sure you've studied the current CDL handbook — the test updates every few years.

Frequently Asked Questions

Do I need an air brakes endorsement in Oregon?

Yes, if your vehicle has air brakes — including most semi-trucks and buses. Oregon requires you to pass the air brakes knowledge test to get the endorsement on your CDL.

How long is the Oregon CDL air brakes test?

It's 25 multiple-choice questions. You have 30 minutes to finish. You need at least 20 correct to pass (80%).

Can I take the Oregon air brakes test online?

No. Oregon DMV only offers the CDL air brakes test at a field office. You can't take it online or at home. Plan a visit.

What happens if I fail the Oregon air brakes test?

You can retry the next day. You get up to three attempts per year. Each retry costs another $10 fee. Study our practice test before going back.

Do I need to bring my own vehicle for the Oregon air brakes skills test?

For the skills test (road test), yes — you must provide a vehicle with air brakes that passes inspection. The knowledge test doesn't require a vehicle.

Reviewed by Jack Mahana, CDL Instructor (13+ years)

Last verified: August 2026 · FMCSA-compliant content