Hill Start Assist
Hill start assist briefly holds the brakes when the driver moves from the brake to the accelerator on a slope, so the car does not roll back.
What is Hill Start Assist?
It typically holds the brake for about one or two seconds or until the engine produces enough drive. It works forwards uphill and in reverse on downhill slopes. It uses the ABS/ESC hydraulic unit and an inclination signal. It is especially useful with manual gearboxes.
How it works
The ESC unit keeps brake pressure after the pedal is released, then releases it when drive torque is detected.
Why it matters for your car
The hold time is short; it does not replace the parking brake. A fault in ABS or ESC often disables hill start assist as well.
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