Subaru WRX & WRX STI Manuals 2016 WRX & WRX STI Owner’s Manual | Page 516

Maintenance and service/Brake booster

Brake booster
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 operates properly if the pedal
stroke decreases with each depression.

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

Brake pedal
Check the brake pedal free play and
reserve distance according to the maintenance schedule in the “Warranty and
Maintenance Booklet”.

& Checking the brake pedal
free play

1)

NOTE
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 malfunctions, and the brake assist system

11-27

0.02 – 0.11 in (0.5 – 2.7 mm)

Stop the engine and firmly depress the
brake pedal several times. Lightly pull the
brake pedal up with one finger to check
the free play with a force of less than 2 lbf
(10 N, 1 kgf).
If the free play is not within proper
specification, contact your SUBARU dealer.
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