Brake Booster; Brake Pedal; Checking The Brake Pedal Free Play; Checking The Brake Pedal Reserve Distance - Subaru Impreza 2016 Owner's Manual

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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 ignition switch in the LOCK /
OFF position, 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.

Brake pedal

Check the brake pedal free play and
reserve distance according to the main-
tenance schedule in the Warranty and
Maintenance Booklet .
Checking the brake pedal
free play
1) 0.02 0.11 in (0.5 2.7 mm)
Turn the ignition switch to the LOCK /
OFF position 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 deal-
er.
Checking the brake pedal
reserve distance
1) More than 2.56 in (65 mm)
Depress the pedal with a force of approxi-
mately 66 lbf (294 N, 30 kgf) and measure
the distance between the upper surface of
the pedal pad and the floor.
When the measurement is smaller than
the specification, or when the pedal does
not operate smoothly, contact with your
SUBARU dealer.