Subaru WRX & WRX STI Manuals 2014 Impreza WRX & WRX STI Owner's Manual | Page 341

11-20

Maintenance and service/Brake booster

& Recommended clutch fluid

Brake booster

functions, and the brake assist system
is operating properly.

If the brake booster does not operate as
described in the following, have it checked
by your SUBARU dealer.
1. With the engine off, depress the brake
pedal several times, applying the same
pedal force each time. The distance the
pedal travels should not vary.
2. With the brake pedal depressed, start
the engine. The pedal should move
slightly down to the floor.
3. With the brake pedal depressed, stop
the engine and keep the pedal depressed
for 30 seconds. The pedal height should
not change.
4. Start the engine again and run for
approximately one minute then turn it off.
Depress the brake pedal several times to
check the brake booster. The brake
booster oper ates properly if the pedal
stroke decreases with each depression.

Brake assist is not a system that brings
more braking ability to the vehicle
beyond its breaking capability.

Refer to “Fluids” F12-7.

CAUTION
Never use different brands of clutch
fluid together. Also, avoid mixing
DOT 3 and DOT 4 brake fluids even if
they are the same brand.

NOTE
For vehicles equipped with the brake
assist system, when you depress the
brake pedal strongly or suddenly, you
might feel that lighter depression of the
brake pedal generates a greater braking force. However, even though these
occur, they do not indicate any mal-