MEDIUM-DUTY EXHAUST BRAKE

The PRXB, Pacbrake’s new exhaust brake, can be mated with Hino proprietary diesels as well as Cummins ISC/ISL/ISB, Cat C-7
3116/3126/3126B/3126E, and Navistar DT466/DT466E/DT530/HT530E engines. An exhaust brake is smaller and lighter than an engine brake, and quieter, which can make it attractive in city operations. According to the Pacbrake people, “…optimum retarding performance is maintained
by maximizing the exhaust back pressure throughout the entire rpm range.” The PRXB automatically adjusts for lower engine speeds and there’s almost no need to downshift, the maker says. It’s invisible to the driver and is said to have higher midrange retarding power than a standard exhaust brake. It maintains almost constant retarding torque and is claimed to offer 35% more retarding power than a standard exhaust brake at
1500 rpm.


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  • I’m running a dt466c and I’m wondering if I install your exhaust brake would it be necessary to change valve springs and if so do you have a recommendation.

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