How does the Jacobs Extarder work?
My m/h is a 1994 Allegro Bus, 5.9B 230 hp (mechanical engine) Cummins DP. It is equipped with a Jacobs Extarder. From what I understand, to stop confusion in what it's called, it is now just called ...
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I agree with Ivylog. BUT, you do not want to confuse the braking provided by a transmission dowhshift with a downshift AND a properly functioning exhaust brake.
