How's a Diesel Exhaust Brake works?

Referring to the above picture will help simplify the explanation of the under-vehicle operation.

An oversized nodular iron housing consisting of two stainless steel butterflies (one large, one small) is added to the exhaust system in front of the muffler. The small butterfly operates in a separate waste gate by-pass port and the large version in the main passage. Notice the large electric solenoid mounted to the nodular housing and protected with the stainless steel heat shield.

When signaled, the solenoid instantly; closes the large butterfly (bottom illustration), creating immediate exhaust pressure for assisting the vehicle's regular brakes. Exhaust flow is now directed through the small by pass port and released by the small butterfly at a pre-determined pressure. This allows for the fastest pressure build-up possible and maintains it longer. Pretty "slick" ...huh?

Back to Exhaust Brake

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Drive Line Service of Las Vegas
Las Vegas Nevada, 89102
(702) 876-3100