Exhaust Brake

An exhaust brake is an optional auxiliary braking system that assists but does not replace the service brake system on vehicles with Cummins engines. Exhaust brakes are not intended for use as the primary braking system during vehicle operation.

The exhaust brake is controlled by a dash-mounted rocker switch. See Fig..

To turn the exhaust brake on, press the upper half of the switch.

The exhaust brake turns itself off automatically. In addition, depressing the accelerator or clutch pedal deactivates the exhaust brake. The ABS, when active, also deactivates the exhaust brake.