Brakes 167 and ensures sufficient support, e.g. when car- rying out rescue operations using the winch. The four-wheel parking brake is released automatically and the parking brake remains applied. Continuous brake Important safety notes The engine brake is used as the continuous brake. The effectiveness of the engine brake depends on the engine speed. A high engine speed results in more effective engine brak- ing. Observe the effective engine braking range marked on the rev counter ( Y page 110). At very low outside temperatures, the engine brake has limited or no effect after the engine has been started.
You can utilise the engine's braking effect, particularly on long downhill gradients, if you: Driving mode X To apply: secure the vehicle with wheel chocks. X Start the engine. X Shift to neutral. X Apply the parking brake ( Y page 166). X Press button : . The П indicator lamp in the status area of the on-board computer display lights up. X To release: release the parking brake ( Y page 166). The four-wheel parking brake and the park- ing brake are released at the same time. The 4-wheel parking brake not assured message appears in the on-board computer display. When a gear is engaged and you pull away, the П indicator lamp in the status area of the on-board computer display goes out.
or R activate the continuous brake R shift to a lower gear in good time The continuous brake is activated automati- cally if: R the vehicle electronics detect that the vehi- cle is loaded after several brake applica- tions and you depress the brake pedal R cruise control or speed limiter intervene in overrun mode X Press button : again. The П indicator lamp in the status area of the on-board computer display goes out. The four-wheel parking brake is released automatically and the parking brake remains applied.
or G WARNING If you activate the continuous brake or shift to a lower gear on a slippery road surface in order to increase the engine's braking effect, the drive wheels may lose traction. There is an increased risk of skidding and an accident. Do not activate the continuous brake and do not shift to a lower gear in order to increase the engine's braking effect on a slippery road surface. X Turn the key to position 0 in the ignition lock. The П indicator lamp in the status area of the on-board computer display goes out. Z