Brake Line; Brake Servo System - Subaru IMPREZA 2002 Service Manual

BRAKE LINE
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PERIODIC MAINTENANCE SERVICES
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3) Check the pedal stroke.
While the engine is idling, depress the brake pedal
with a 490 N (50 kgf, 110 Ib) load and measure the
distance between the brake pedal and steering
wheel. With the brake pedal released, measure the
distance between the pedal and steering wheel
again. The difference between the two measure-
ments must be less than 95 mm (3.74 in). If the dis-
tance is more than specified, there is a possibility
air is in the inside of the hydraulic unit.
Brake pedal reserve distance: A
more than 95 mm (3.74 in)/490 N (50 kgf, 1 10
lb)
ti
-
1 2 = A
I
steer i ng
4 \
c-
.
4) Check to see if air is in the hydraulic brake line by
the feel of pedal operation. If air appears to exist in
the line, bleed it from the system.
5) Check for even operation of all brakes, using a
brake tester or by driving the vehicle for a short dis-
tance on a straight road.
2. 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) Check the valve is built into vacuum hose. Dis-
connect the vacuum hose to inspect function of
check valve.
Blow air into vacuum hose from its brake booster
side end: Air must flow out of engine side end of
hose. Next blow air into hose from engine side: Air
should not flow out of hose.
Replace the both check valve and vacuum hose if
the check valve is faulty. Engine side of vacuum
hose is indicated by marking "ENGINE as shown.
Engine side Brake booster side
G10053A
5) Check the vacuum hose for cracks or other dam-
age.
NOTE:
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 tight
and secure.
PM-26