Oregon Air Brakes Test
You'll hit Cabbage Hill on I-84 with a loaded log truck behind you — your air brakes better be right.
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Oregon's air brakes test is 25 questions. You need 80% to pass. Start practicing now.
Key Topics
- •System components and inspection
- •Brake lag and stopping distances
- •Mountain driving and emergency braking
About the Oregon Air Brakes Test
Topics Covered
- ✓Air brake system components — Oregon examiners want you to identify parts like the air compressor, governor, and brake chambers. You'll see them on logging trucks daily.
- ✓Pre-trip inspection procedures — In Oregon, you're required to check slack adjusters before every trip. Snow and ice can hide problems.
- ✓Brake lag and stopping distance — On wet Oregon highways, brake lag adds critical feet. Know how it changes on a grade.
- + 3 more topics
📘 Study Tips & State Info
Oregon DMV examiners love asking about brake lag and stopping distance on grades. They'll give you a scenario like 'You're coming down I-84 east of Hood River with a full load. What's the first thing you do to control your speed?' The answer is always about proper gear selection before you start down. Don't just say 'use brakes.'
Another thing: Oregon examiners focus on the pre-trip air brake check procedure. They want the exact steps — build pressure, cut out, cut in, then pump down. Know the numbers: 100-120 psi normal, warning light at 60 psi, spring brakes pop at 20-40 psi. They'll ask about the low air warning device and what to do if it activates on the road.
Chain laws matter here. Oregon has specific chain requirements for commercial vehicles on I-5 and US-26 in winter. The test includes questions about how chains affect air brake performance and stopping distance. Think about real conditions: chains on wet pavement can reduce braking effectiveness.
Oregon DMV handles CDL testing at 30+ offices statewide. You'll need an appointment — walk-ins rarely work for CDL written tests. Call ahead or book online at OregonDMV.com. The fee for the air brakes endorsement is $5 plus the standard CDL test fee (around $10). Make sure you bring your current medical examiner's certificate.
Oregon requires all CDL applicants to pass the General Knowledge test before taking any endorsement tests. You can take the air brakes test on the same day if you pass General Knowledge first. The test is 25 multiple-choice questions, and you have 30 minutes. Oregon DMV doesn't allow retakes on the same day — you must wait until the next business day.
One unique Oregon rule: if you're applying for a Class A CDL and your vehicle has air brakes, you must pass this test before the skills exam. No exceptions. Also, Oregon's manual includes a section on mountain driving with air brakes that goes beyond the federal standard. Study it.
About the Oregon Air Brakes Test
Oregon isn't flat. You'll face mountain passes like the Siskiyou Summit on I-5 and Cabbage Hill on I-84. Your air brakes need to work perfectly when you're hauling 80,000 pounds down a 6% grade. The Oregon Air Brakes Test makes sure you understand how to keep that trailer under control.
Logging trucks are everywhere in Oregon, especially west of the Cascades. Those rigs use air brakes constantly on winding forest roads. The test covers everything from slack adjuster inspection to emergency braking on wet pavement. Oregon examiners expect you to know how moisture in the system affects braking — because it rains here a lot.
This test is for anyone adding an air brakes endorsement to their CDL, or for Class A applicants who'll operate vehicles with air brakes. You'll take it at any Oregon DMV office that offers CDL testing. The questions follow federal standards but include state-specific details like chain-up requirements and mountainous terrain considerations.
Don't just memorize answers. Understand why you do a pre-trip air brake check the way you do. That knowledge keeps you alive on Oregon's roads.
Topics Covered
Study Tips
Oregon DMV examiners love asking about brake lag and stopping distance on grades. They'll give you a scenario like 'You're coming down I-84 east of Hood River with a full load. What's the first thing you do to control your speed?' The answer is always about proper gear selection before you start down. Don't just say 'use brakes.'
Another thing: Oregon examiners focus on the pre-trip air brake check procedure. They want the exact steps — build pressure, cut out, cut in, then pump down. Know the numbers: 100-120 psi normal, warning light at 60 psi, spring brakes pop at 20-40 psi. They'll ask about the low air warning device and what to do if it activates on the road.
Chain laws matter here. Oregon has specific chain requirements for commercial vehicles on I-5 and US-26 in winter. The test includes questions about how chains affect air brake performance and stopping distance. Think about real conditions: chains on wet pavement can reduce braking effectiveness.
Oregon Specific Information
Oregon DMV handles CDL testing at 30+ offices statewide. You'll need an appointment — walk-ins rarely work for CDL written tests. Call ahead or book online at OregonDMV.com. The fee for the air brakes endorsement is $5 plus the standard CDL test fee (around $10). Make sure you bring your current medical examiner's certificate.
Oregon requires all CDL applicants to pass the General Knowledge test before taking any endorsement tests. You can take the air brakes test on the same day if you pass General Knowledge first. The test is 25 multiple-choice questions, and you have 30 minutes. Oregon DMV doesn't allow retakes on the same day — you must wait until the next business day.
One unique Oregon rule: if you're applying for a Class A CDL and your vehicle has air brakes, you must pass this test before the skills exam. No exceptions. Also, Oregon's manual includes a section on mountain driving with air brakes that goes beyond the federal standard. Study it.