Mersedes SUV Manuals

Adaptive brake

Mercedes-Benz GL-Class / Mercedes-Benz GL-Class Owners Manual / Safety / Driving safety systems / Adaptive brake

Adaptive brake enhances braking safety and offers increased braking comfort. In addition to the braking function, adaptive brake also has the hold function   and hill start assist  .


Observe the "Important safety notes" section  .

PRE-SAFE Brake is only available in vehicles with DISTRONIC PLUS.

If PRE-SAFE Brake is to aid you, the radar sensor system must be:
activated  operational With the help of the radar sensor system, PRE-SAFE Brake can detect obstacles that are in front of your vehicle for an extended period of time.

PRE-SAFE Brake can help you to minimize the risk of a collision with a vehicle ahead or reduce the effects of such a collision. If PRESAFE Brake has detected a risk of collision, you will be warned visually and acoustically as well as by automatic braking. PRE-SAFE Brake cannot prevent a collision without your intervention.

Starting at a speed of around 4 mph (7 km/h), this function warns you if you very quickly approach a vehicle in front.

An intermittent warning tone will then sound and thlightdistance warning lamp will
light up in the instrument cluster.

Brake immediately in order to increase the distance from the vehicle in front.

Take evasive action provided it is safe to do so.

From a speed of approximately 4 mph (7 km/h), if the driver and front passenger have fastened their seat belts, PRE-SAFE Brake can brake the vehicle automatically at speeds up to approximately 124 mph (200 km/h).

Due to the nature of the system, particularly complicated driving conditions may cause unnecessary warnings or the unnecessary intervention of PRE-SAFE Brake.

You can prevent the intervention of the PRESAFE Brake at any time by:
depressing the accelerator pedal further activating kickdown releasing the brake pedal The braking action of PRE-SAFE Brake is ended automatically if:
you maneuver to avoid the obstacle.

there is no longer any danger of a rear-end collision.

there is no longer an obstacle detected in front of your vehicle.

If you have activated DSR  , PRESAFE Brake is deactivated.

At speeds of up to approximately 40 mph (70 km/h), PRE-SAFE Brake can also detect stationary objects. Examples of stationary objects are stopped or parked vehicles.

If you approach an obstacle and PRE-SAFE Brake detects a risk of a collision, the system will alert you both visually and acoustically. If you do not brake or take evasive action, the system will warn you by automatically braking the vehicle gently. If there is an increased risk of collision, preventative passenger protection measures (PRE-SAFE) are activated  . If, at speeds over 20 mph (30 km/h), a risk of collision remains and you do not brake, take evasive action or significantly accelerate, automatic braking may be performed up to a level of automatic emergency braking. Automatic emergency braking is not performed until immediately prior to an accident that can no longer be avoided.


PRE-SAFE Brake will initially brake your vehicle by a partial application of the brakes if a danger of collision is detected. There may be a collision unless you also brake.

Automatic emergency braking cannot prevent a collision. There is a risk of an accident.

Always apply the brakes yourself and try to take evasive action.


PRE-SAFE Brake cannot always clearly identify objects and complex traffic conditions.

In these cases, PRE-SAFE Brake may: give an unnecessary warning and then brake the vehicle
not give a warning or intervene There is a risk of an accident.

Always pay particular attention to the traffic situation and be ready to brake, especially if PRE-SAFE Brake warns you. Terminate the intervention in a non-critical driving situation.

In particular, the detection of obstacles can be impaired if:
there is dirt on the sensors or anything else covering the sensors
snow or heavy rain interference by other radar sources there are strong radar reflections, for example in parking garages a narrow vehicle traveling in front, e.g. a motorbike
a vehicle traveling in front on a different line relative to the center of your vehicle


PRE-SAFE Brake does not react: to people or animals to oncoming vehicles to crossing traffic when cornering As a result, PRE-SAFE Brake may neither give warnings nor intervene in all critical situations. There is a risk of an accident.

Always pay careful attention to the traffic situation and be ready to brake.

In order to maintain an appropriate distance from the vehicle in front and thus prevent a collision, you must apply the brakes yourself.

To activate/deactivate: activate or deactivate PRE-SAFE Brake in the onboard computer  .

When PRE-SAFE Brake is activated, the display as long as the HOLD function is deactivated  . On vehicles with symbol appears in the multifunction
display as long as the HOLD function is deactivated  . On vehicles with Active Parking Assist, the is symbol
is displayed when P is engaged or you are driving faster than 22 mph (35 km/h).

Following damage to the front end of the vehicle, have the configuration and operation of the radar sensors checked at a qualified specialist workshop. This also applies to collisions at low speeds where there is no visible damage to the front of the vehicle.

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