An exhaust brake makes navigating downhill grades and mountainous terrain easier and safer than the vehicle’s conventional braking system.
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 is 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 throughout the engine RPM.
Trucks with automatic transmission should also use a TowLoc, AutoLoc or TorqLoc control for best retarding results.