Buick Regal Owners & Service Manuals

Buick Regal: Brake Assist

The Brake Assist feature is designed to assist the driver in stopping or decreasing vehicle speed in emergency driving conditions. This feature uses the stability system hydraulic brake control module to supplement the power brake system under conditions where the driver has quickly and forcefully applied the brake pedal in an attempt to quickly stop or slow down the vehicle. The stability system hydraulic brake control module increases brake pressure at each corner of the vehicle until the ABS activates.

Minor brake pedal pulsation or pedal movement during this time is normal and the driver should continue to apply the brake pedal as the driving situation dictates. The Brake Assist feature will automatically disengage when the brake pedal is released or brake pedal pressure is quickly decreased.

Hill Start Assist (HSA)

The Hill Start Assist (HSA) feature will activate when the vehicle is stopped on a moderate to steep grade to help prevent it from rolling in an unintended direction. After the brake pedal has been released and before the accelerator pedal has been pressed, HSA uses braking pressure to hold the vehicle stationary. If HSA is holding the vehicle, a Driver Information Center (DIC) message displays. HSA will not activate in a forward drive gear when facing downhill, or in R (Reverse) when facing uphill.

Select the duration of the HSA feature through vehicle personalization. See "Extended Hill Start Assist" under "Comfort and Convenience" in Vehicle Personalization. When Standard Hold is selected, the vehicle is held stationary for up to two seconds after the brake pedal is released. When Extended Hold is selected, the vehicle is held stationary for up to five minutes after the brake pedal is released. In either case, override the hold feature by pressing the accelerator pedal and attempting to drive away.

If Standard Hold is selected, it will hold the vehicle for two seconds unless the driver door is opened or the driver seat belt is unbuckled after releasing the brake pedal.

If Extended Hold is selected, it will hold the vehicle for five minutes unless the driver door is opened and the driver seat belt is unbuckled prior to releasing the brake pedal.

When deactivated after five minutes, or if it is deactivated when the driver seat belt is unlatched or the driver door is opened, the Electric Parking Brake will engage to prevent vehicle movement.

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