Hill Start Assist is only on models that deploy the EGS gearbox, granted the picture displayed does show a manual car but the system is designed for the EGS.
The reason it exists is because the EGS is a automated manual gearbox which uses a clutch and therefore has no 'creep' which normally overcomes starting off on a hill. Because as soon as you release the brake on an EGS car the car can 'roll', and on a hill you definitely don't want this, so the system applies pressure to the brakes in order to allow you to move from one pedal to another.
The reason it exists is because the EGS is a automated manual gearbox which uses a clutch and therefore has no 'creep' which normally overcomes starting off on a hill. Because as soon as you release the brake on an EGS car the car can 'roll', and on a hill you definitely don't want this, so the system applies pressure to the brakes in order to allow you to move from one pedal to another.
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