Dynamic Apply

While the vehicle is moving, the dynamic apply mode provides emergency braking. At a vehicle speed greater than 2 mph (3 km/h), pulling up and holding the EPB switch produces a gradual deceleration of the vehicle. The red parking brake warning indicator illuminates, accompanied by a warning in the message center and a warning chime. The vehicle stop lamps also illuminate, activated by a CAN bus message from the EPB module to the CJB. Dynamic apply operation is cancelled if the EPB switch is either released or pressed down to the release position, or the accelerator pedal is pressed.

There are four modes of dynamic apply, which the EPB module uses in the following order of preference:

• Electronic Controlled Deceleration (ECD)
• Rear Wheel Unlocker (RWU)
• Dynamic Standstill Detection (DSD)
• DSD+.

The ECD mode uses hydraulic braking on all four wheels to decelerate the vehicle. The other three modes all use the EPB actuators to operate the rear brakes to decelerate the vehicle.