Utah Air Brakes Test

About the Utah Air Brakes Test

Utah's highways test your air brake skills daily. You'll face steep grades on I-80 through Parleys Canyon and long downhills on I-15 near the Point of the Mountain. Our test covers the exact scenarios you'll encounter.

Utah's weather adds another layer. Snow, ice, and heat all affect your braking distance. You need to know how to adjust for mountain passes and desert stretches.

We pulled these questions straight from the Utah CDL Handbook. Study them, and you'll be ready for the DMV written test.

What This Test Covers

• Air compressor cut-in and cut-out – critical for Utah's high-altitude passes where air pressure drops faster.
• Brake lag distance – you'll need this on I-15's heavy traffic near Salt Lake.
• Dual air brake systems – Utah requires them on most trucks; know how they split.
• Spring brakes and parking brake – don't let your truck roll on Utah's steep parking lots.
• Low air pressure warning – a common failure point during Utah DMV pre-trip inspections.
• Using the brake pedal vs. engine brake – you'll rely on both on I-80's long downgrades.

Study Tips

Study the Utah CDL Handbook's air brake section word for word. The test pulls every question from that book. We recommend reading it twice – once for understanding, once for memorizing key numbers like cut-in pressure (100 psi) and cut-out (125 psi).

Utah examiners watch your pre-trip inspection closely. Practice saying each step out loud. They want to see you check the air compressor, check the slack adjusters, and test the low-pressure alarm. Do it slow and deliberate.

Utah DMV Information

You'll take the air brakes written test at any Utah DMV office that offers CDL services. Major locations include Salt Lake City (2100 S), St. George, Ogden, and Provo. You can schedule your appointment online – walk-ins often wait hours. The written test costs $15 for each endorsement. The skills test (if you need the L endorsement) costs $80 and requires a separate appointment.

Bring your current CDL instruction permit, proof of identity, and your payer number. You don't need a vehicle for the written test – just a pencil. Pass the air brakes written test, and you'll get the 'L' endorsement on your permit.

Frequently Asked Questions

Related Resources

Other Utah CDL Practice Tests

Test Details

• State: Utah
• Test: Air Brakes Test
• Questions: 118
• Passing Score: 80%
• Time Limit: 30 minutes
• Cost: Free

Need ELDT Training?

If you're getting your first CDL, you need ELDT theory training before your skills test.