A feature that makes navigating downhill grades and mountainous terrain easier and much safer than the vehicle’s conventional braking system is an exhaust brake.
The exhaust brake unit works by cutting off the exhaust flow from the engine through the closure of a high temperature resistant, stainless steel, butterfly valve. The valve is engaged electrically, by air or vacuum to close off the exhaust flow causing increased backpressure in the engine. This backpressure provides the retarding horsepower to slow the vehicle down on even the steepest descents.
Once engaged, by a toggle switch conveniently mounted on the dashboard, or wired through the Allison computer the brake is basically automatic. Backpressure maintained by a regulated orifice. The brake releases as soon as either the throttle is applied, or the switch is flipped off.
BD`s exclusive Variable Orifice design out retards any other brake on the market through out the engine RPM.