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Vehicle Dynamics and Driver Assist Systems
May 2017
Brake Assist
Introduced with some 2007 MY vehicles, a Brake Assist system was added to assist in
deceleration during panic situations. In an emergency stopping situation, a driver has the
natural tendency not to brake hard enough and soon enough. Brake Assist helps the driver
by monitoring the depression speed applied to the brake pedal. In an emergency stopping
situation, the system senses the rapid depression of the brake pedal and simultaneously
boosts the driver’s braking force to the brake system using the VDCCM & H/U pressure
increase function. Brake Assist maintains braking force until the driver releases the brake pedal.
In conjunction with ABS, Brake Assist results in faster and safer braking.
Optimized Hydraulic Braking (OHB)
Introduced with 2017MY Impreza models, the Optimized Hydraulic Braking (OHB) system
ensures sufficient braking force is available for the driver if the Brake Booster pressure is less
than optimal. This is accomplished by energizing the VDC motor pump to provide additional
hydraulic pressure assist.
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