Subaru 2009 IMPREZA Service Manual page 98

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PERIODIC MAINTENANCE SERVICES

3. BRAKE SERVO SYSTEM

1) With the engine off, depress the brake pedal

several times applying the same pedal force. Make

sure the travel distance should not change.

2) With the brake pedal depressed, start the en-

gine. Make sure the pedal should move slightly to-

ward the floor.

3) With the brake pedal depressed, stop the engine

and keep the pedal depressed for 30 seconds.

Make sure the pedal height should not change.

4) A check valve is built into the vacuum hose. Dis-

connect the vacuum hose to inspect function of

check valve.

Blow compressed air into vacuum hose from the

end of brake booster side. Check that the air flows

from the air hose on engine side. Next blow air into

hose from engine side: Check that the air does not

flow from the hose.

Replace the both check valve and vacuum hose if

the check valve is faulty. Engine side of vacuum

hose is indicated by marking "ENG" as shown.

(A) Engine side

(B) Brake booster side

5) Check the vacuum hose for cracks or other dam-

When installing the vacuum hose on the engine

and brake booster, do not use soapy water or lubri-

cating oil on their connections.

6) Check the vacuum hose to make sure it is tightly