See also:

Auto-brake
If a collision is imminent and the driver has not applied the brakes or begun to steer around the vehicle or pedestrian, the auto-brake function is activated without the driver pressing the brake ...

Volvo XC90 Owners Manual
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Brake fluid reservoir
The brake fluid should always be above the MIN mark on the side of the reservoir. Check, without removing the cap, that there is sufficient fluid in the reservoir. Fluid type: DOT 4+ boiling poi ...