Subaru Impreza Manuals 2023 Impreza Owner's Manual | Page 314

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Starting and operating / Braking
to depress the pedal much harder than during normal braking , and the braking distance will increase .
! Supplemental booster function when vacuum pressure fails
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While the ignition switch is turned “ ON ” and the engine is running , the supplemental booster function operates when the brake booster performance is decreased due to insufficient vacuum boost .
When the brake pedal is depressed while the supplemental booster function is operating , an operation sound and brake pedal vibration may be generated . This is not a malfunction .
! Brake assist system
WARNING
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Do not be overconfident about the brake assist . It is not a system that brings more braking ability to the vehicle beyond its braking capability . Always use the utmost care when driving regarding vehicle speed and safe distance .
CAUTION
When you need to brake suddenly , continue depressing the brake pedal strongly to bring the effect of the brake assist .
Brake assist is a driver assistance system . It assists the brake power when the driver cannot depress the brake pedal strongly and the brake power is insufficient .
Brake assist generates the brake power according to the speed at which the driver depresses the brake pedal .
NOTE
When you depress the brake pedal strongly or suddenly , the following phenomena occur . However , even though these occur , they do not indicate any malfunctions , and the brake assist system is operating properly .
. You might feel that the brake pedal is applied by lighter force and generates a greater braking force . . You might hear an ABS operating noise from the engine compartment .
& Disc brake pad wear warning indicators
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The disc brake pad wear warning indicators on the disc brakes give a warning noise when the brake pads are worn .
If a squeaking or scraping noise is heard from the disc brakes while braking , immediately have your vehicle checked by your SUBARU dealer .