Dynamic Apply

While the vehicle is moving, the dynamic apply mode gives emergency braking. Operating and holding the Electric Park Brake (EPB) switch in the apply position produces a gradual deceleration of the vehicle. This process will take place at a vehicle speed greater than 3 km/h (2 mph). The red EPB warning indicator illuminates, together with a warning in the message center and a warning chime.

The vehicle stop lamps come on, activated by a message from the Anti-Lock Brake System (ABS) control module to the Body Control Module/Gateway Module (BCM/GWM).

The dynamic apply operation is cancelled in the following cases:

• The EPB switch is either released to its neutral position.
• The EPB switch is operated to the release position.
• The accelerator pedal is pressed.

There are 3 modes of dynamic apply, which the ABS control module uses in the following order of preference:

• Hydraulic Dynamic Brake Function (HDBF)
• Degraded Dynamic Brake Function (DDBF)
• Actuator Dynamic Brake Function (ADBF)

The HDBF and DDBF modes use hydraulic braking on all 4 wheels to decelerate the vehicle. The ADBF mode uses the EPB actuators to operate the rear brakes to decelerate the vehicle.