At what pressure do spring brakes apply?

Between 20 and 45 psi as the air system loses pressure.

Spring Brakes — How CDL Parking Brakes Work

Spring Brakes

How spring (parking) brakes work, when they apply automatically, and why they are the fail-safe of the air brake system.

Difficulty

Reading time

5 min

Applies to

All states

Official source

49 CFR Part 393 Subpart C

How spring brakes work

Inside each combination brake chamber is a large coiled spring. When air pressure fills the chamber, it compresses the spring and holds the brakes off. Release the parking valve — or lose air pressure — and the spring extends, applying the brakes with mechanical force.

Why they matter

They provide emergency stopping if the service brakes lose air.
They act as the vehicle's parking brake.
They apply automatically below 20–45 psi.

Rules to remember

Never use the parking brake if the brakes are wet and freezing — they can freeze locked.
Never leave a truck parked with only the service brake applied.
Do not press the brake pedal while spring brakes are set — you can damage the linkage by "compounding" the brakes.

Key facts to remember about Spring Brakes

The material on this page is drawn from the FMCSA CDL Manual and, where a state rule differs, from the relevant state DMV manual. That is the same regulatory language your examiner will grade your written test against. When you sit for the CDL exam, questions on Spring Brakes are not usually trick questions — they test whether you have internalized the specific numbers, definitions, and procedures above and can apply them under time pressure.

Two habits separate drivers who pass this section on the first try from those who have to retake it. The first is treating the quick-answer box at the top of this guide as a fact you have to be able to write out from memory — not just recognize when you see it. The second is reading the common-mistakes list with the assumption that at least one of those wrong patterns is going to show up as a distractor on your exam. Both habits take five minutes per guide and dramatically reduce the number of questions you flag as "not sure" on test day.

How Spring Brakes fits the rest of your CDL study plan

This is one guide inside a Air Brakes topic pack on CDLTest360. The full topic covers every subject the FMCSA CDL Manual expects a commercial driver to know before taking the written exam. After you have worked through this page, the fastest way to lock in the material is to take a short practice test that draws from the same question pool your state DMV uses. Missed questions link back to the guide that answers them, so weak spots surface themselves — no guessing about what to re-read.

If any acronym or part name on this page is unfamiliar, every one of them is defined in the CDL glossary. Terms are auto-linked on first mention, so you can jump to a definition and come right back without losing your place. And if you are studying for a state-specific rule that is not identical to the federal regulation, always let your state CDL manual take precedence — this site is built on FMCSA material, and a handful of numbers (medical certification windows, permit-holding periods, endorsement fees) do vary by state.

Ready to test yourself?

Once you feel like you own this page, take a practice test on Air Brakes to prove it. Aim for a strong pass rate before moving on. If you are preparing for the full CDL exam, browse the rest of the CDLTest360 Learning Center — every topic in your state CDL manual has a matching guide, and each one is written the same way this page is: quick answer first, plain-English explanation second, real-world common mistakes third.

How to study this guide

A short, high-yield loop for locking in the material on this page before you sit the CDL exam:

1.Read the TL;DR quick answer at the top of this guide and re-write it in your own words. If you can't, read the body once and try again — that's the fact you're being tested on.
2.Walk through the common-mistakes section below. Every item on that list is a real reason drivers have failed this question in the past.
3.Take the linked practice test. Aim for 90% or better on the Air Brakes section before you move on.
4.The day before your official DMV test, re-read only the TL;DR box and the common-mistakes list on every guide you studied. That's your final review.

Why this matters for your CDL exam

Air Brakes is one of the sections the CDL written exam draws from directly. Examiners score against the exact language of the FMCSA CDL Manual, which is why every guide on CDLTest360 keeps the regulatory wording where it matters and only rewrites the surrounding explanation. If you understand spring brakes at the level of this page — the numbers, the definitions, and the reasons behind them — you'll recognize the correct answer even when the question is phrased differently than the practice tests you've seen.

One more thing worth knowing: the CDL written exam does not test memorization for its own sake. It tests whether you can apply these rules on the road, so anywhere in this guide you see a number, a step, or a component name, pair it in your head with when a driver would actually use it. That mental link is what turns a fact you read into an answer you can pick under time pressure on exam day.

Common mistakes

Compounding the brakes by pressing pedal with parking brake set
Assuming spring brakes need air to apply
Parking without setting the spring brakes

Frequently asked questions

At what pressure do spring brakes apply?: Between 20 and 45 psi as the air system loses pressure.

Test your knowledge

Put this guide into practice with a free CDLTest360 quiz.

Take the practice test More Air Brakes guides

About this guide

This guide is part of the CDLTest360 Learning Center, a free set of study materials written for drivers preparing for the Commercial Driver's License (CDL) written exam in the United States. Every fact on this page comes from the current FMCSA CDL Manual or, where a state rule differs, the state DMV manual. Numbers, definitions, and procedures are quoted or paraphrased from those official sources; the surrounding explanation, the examples, and the common-mistakes list are original to CDLTest360.

The Learning Center is written by CDL instructors and reviewed against the federal regulations on a rolling basis. If you spot something that doesn't match what your local DMV taught you, state rules take precedence over anything on this site — always confirm the number with your state's CDL manual before your exam.