Go Back   Team-BHP > Under the Hood > Technical Stuff

Thread Tools Search this Thread
Old 20th June 2008, 21:13   #1
bluestraveller's Avatar
Join Date: Jan 2008
Location: ಕರ್ನಾಟಕ
Posts: 117
Thanked: 3 Times
Default Signs saying "No engine brakes" - Why?

I have seen sign boards that say "Do Not Use Engine Brakes" on quite a few roads on the US. I have never really understood this but my closest guess would be noise pollution? Can anybody elaborate?
bluestraveller is offline   Reply With Quote
Old 20th June 2008, 21:57   #2
Team-BHP Support
aah78's Avatar
Join Date: Feb 2004
Location: NYC / BOM
Posts: 3,368
Thanked: 1,318 Times
Arrow noise & slip

Yes, you've understood correctly. That's a warning for trucks.
It's mostly due to the loud noise that engine brakes produce when engaged but the warning may also be displayed in case there's a chance of slipping (eg. icy roadways).

For technical details on engine brakes, you can look up Google.

Ever heard a sudden loud noise - like a machine gun going off inside your head - while driving on the freeway? That's the semi in the next lane using his engine brake.
aah78 is offline   Reply With Quote
Old 21st June 2008, 00:27   #3
Distinguished - BHPian
Join Date: May 2005
Location: KL 01
Posts: 4,287
Thanked: 1,932 Times

Here are couple of you tube videos on jake braking trucks.

Sankar is offline   Reply With Quote
Old 21st June 2008, 19:49   #4
Senior - BHPian
Randhawa's Avatar
Join Date: Oct 2007
Location: Brighton
Posts: 1,070
Thanked: 217 Times

Engine brakes with trucks is something to do with opening the exhaust valves to TDC to slow down the engine hence reducing the brakes without actually applying the brakes.
Randhawa is offline   Reply With Quote
Old 23rd June 2008, 03:54   #5
noidaboy's Avatar
Join Date: Jul 2006
Location: Noida
Posts: 988
Thanked: 236 Times

According to the 2nd video it does sound like machine gun being fired.
noidaboy is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Unsolicited "No Parking In Front of The Gate" signs! mooza Street Experiences 40 22nd January 2013 10:47
Clarkson upsets Nissan by saying electric cars are "not the future" noopster The International Automotive Scene 55 14th December 2011 14:31
"Cayenne" we "XC-eed" in our "Endeavour" to "Safari"? Taking powerful metal off-road SS-Traveller 4x4 Excursions 54 1st December 2010 17:04
Retarder in Volvo B7R buses (air-brakes / jake brakes) sfilinto Commercial Vehicles 12 30th March 2010 00:55

All times are GMT +5.5. The time now is 14:34.

Copyright 2000 - 2016, Team-BHP.com
Proudly powered by E2E Networks