Hill Start Assist - Volvo XC 90 Owner's Manual

Hill start assist

Hill start assist, Hill Start Assist (HSA), prevents
the car from rolling backwards when starting on
an uphill gradient. When reversing uphill, it pre-
vents the car from rolling forwards.
The function means that the pedal pressure in
the brake system remains for several seconds
while the driver's foot is moved from brake pedal
to accelerator pedal.
The temporary braking effect releases after sev-
eral seconds or when the driver accelerates.
Hill start assist is available even if the function for
automatic braking when stationary (Auto hold) is
deactivated.
Related information
•
Brake functions (p. 362)
•
Automatic braking when stationary (p. 369)
Automatic braking when stationary
Automatic braking when stationary (Auto Hold)
means that the driver can release the brake
pedal while maintaining braking effect when the
car has stopped at traffic lights or a junction.
When the car has stopped, the brakes are acti-
vated automatically. The function can use either
foot brake or parking brake to hold the car sta-
tionary and it works on all gradients. When the
accelerator pedal is depressed again, the brakes
are released.
When braking to a stop on a downhill or uphill
gradient - depress the brake pedal a bit harder
before releasing to ensure that the car does not
roll at all.
If the driver switches off the engine when the car
is stationary, the parking brake is applied.
STARTING AND DRIVING
Switch for automatic brake
The switch illuminates when the function is activated.
Activate or deactivate Auto Hold with the switch
in the tunnel console. The function remains deac-
tivated until it is reactivated.
When the function is deactivated, hill start assist
(HSA) remains active to prevent the car from roll-
ing backwards when starting on an uphill gradi-
ent.
Symbols in the driver display
Symbol Specification
The symbol is illuminated when the
function uses the foot brake to
keep the car stationary.
The symbol is illuminated when the
function uses the parking brake to
keep the car stationary.
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