Washington Engine & Jake Brake Rules

State law (RCW 46.37.395) hits any truck at or above 10,001 lb GVWR: run an engine brake only through a working muffler, and a turbocharger does not count as one. Fines are $250, $500, then $750 for repeats. The actual 'no engine brake' signs are local, posted at Cascade pass towns, Leavenworth, and residential edges. Keep using the brake on open grades where nothing is posted.

Ban scopeLocal / posted

Muffler lawYes (the legal hook)

Where postedNo statewide ban on the act

Fine$250 first / $500 second / $750 third-plus under RCW 46

01 The rule

How Washington handles engine braking

02 On the road

What to watch for

Ban scope: Local / posted
Where posted & enforced: No statewide ban on the act. 'No engine brake' signs are local and cluster in Cascade pass and mountain-corridor towns and residential edges: US 2 around Leavenworth, the Snoqualmie/Blewett Pass approaches, Cle Elum, and small towns strung along truck routes. Enforcement is real in noise-sensitive towns at the bottom of grades and light elsewhere.
Muffler / noise law: Yes, the real legal hook
Fine: $250 first / $500 second / $750 third-plus under RCW 46.37.395 for the muffler violation; local sign-zone citations vary by ordinance.

Washington Engine Brake FAQ

Are engine brakes banned in Washington?

Washington has no statewide ban. The restriction is local and posted on "NO ENGINE BRAKE" signs. State law.

Where are the "NO ENGINE BRAKE" signs in Washington?

No statewide ban on the act. 'No engine brake' signs are local and cluster in Cascade pass and mountain-corridor towns and residential edges: US 2 around Leavenworth, the Snoqualmie/Blewett Pass approaches, Cle Elum, and small towns strung along truck routes. Enforcement is real in noise-sensitive towns at the bottom of grades and light elsewhere.

What is the fine for using an engine brake where it is banned in Washington?

$250 first / $500 second / $750 third-plus under RCW 46.37.395 for the muffler violation; local sign-zone citations vary by ordinance.

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 Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it.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://app.leg.wa.gov/rcw/default.aspx?cite=46.37.395. See our Terms & Disclaimer.

03 Related

Check Washington before you roll

Live weather, closures, and hazards on one map. Free, no account.

Open Live Map →

Washington Engine & Jake Brake Rules

How Washington handles engine braking

What to watch for

Washington Engine Brake FAQ

More for Washington

Washington Speed Limits

Washington 511

All States

Check Washington before you roll