Exhaust Brake, Cummins Engines
An exhaust brake is an optional auxiliary braking system that assists but does not replace the service brake system. The exhaust brake may be used in conjunction with the service brakes in off-highway and mountain driving as well as in traffic or high-speed highway driving. 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. or see .
Fig. 1, Exhaust Brake Switch
Fig. 2, Exhaust Brake Switch
To turn the exhaust brake on, press the upper part of the rocker. When the exhaust brake is on, an amber light illuminates behind the switch. When the panel lights are on, the EXHST BRK legend is backlit in green.
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.