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Engine Brake Laws No. MO Local / posted

Missouri Engine & Jake Brake Rules

No statewide ban on engine braking in Missouri. The real law is the muffler and excessive-noise statute (RSMo 307.170): keep an adequate muffler, no cutouts, no unnecessary noise. Towns do the actual restricting. Places like Russellville and Peculiar post 'no engine brake' or muffler-required signs on truck routes and near homes. Back off where a sign is up. Keep the engine brake on for the grades that have none.

Ban scopeLocal / posted
Muffler lawYes (the legal hook)
Where postedLocal, not statewide
FineUsually a local noise-ordinance citation, commonly about $50 to $500

A detail here is flagged medium confidence — confirm with the state DMV or the local ordinance before you rely on it.

01 The rule

How Missouri handles engine braking

No statewide ban on engine braking in Missouri. The real law is the muffler and excessive-noise statute (RSMo 307.170): keep an adequate muffler, no cutouts, no unnecessary noise. Towns do the actual restricting. Places like Russellville and Peculiar post 'no engine brake' or muffler-required signs on truck routes and near homes. Back off where a sign is up. Keep the engine brake on for the grades that have none.

02 On the road

What to watch for

Missouri Engine Brake FAQ

Are engine brakes banned in Missouri?
Missouri has no statewide ban. The restriction is local and posted on "NO ENGINE BRAKE" signs. No statewide ban on engine braking in Missouri.
Where are the "NO ENGINE BRAKE" signs in Missouri?
Local, not statewide. Small towns and cities on state highways post 'no engine brake' or 'muffler required' signs near residential edges. Russellville and Peculiar have ordinances on the books, and St. Charles County regulates vehicle equipment. Enforcement is light across rural Missouri, heavier where a town has a noise ordinance and cares about it.
What is the fine for using an engine brake where it is banned in Missouri?
Usually a local noise-ordinance citation, commonly about $50 to $500. The state muffler/excessive-noise violation (RSMo 307.170) is a separate infraction.

Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://revisor.mo.gov/main/OneSection.aspx?section=307.170. See our Terms & Disclaimer.

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