Subaru Legacy 2002 Service Manual page 91

Periodic Maintenance Services
3) Check the pedal stroke.
While the engine is idling, depress the brake pedal
with a 490 N (50 kgf, 110 lb) 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
distance is more than specified, there is a possibil-
ity 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,
110 lb)
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
distance 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
engine: Make sure the pedal should move slightly
toward the floor.
3) With the brake pedal depressed, stop the
engine and keep the pedal depressed for 30 sec-
onds: Make sure the pedal height should not
change.
4) Check valve is built into vacuum hose. Discon-
nect 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 both check valve and vacuum hose if
check valve is faulty. Engine side of vacuum hose
is indicated by marking "ENGINE" as shown.
BRAKE LINE
5) Check 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 vacuum hose to make sure it is tight and
secure.
GI0052A
SA07694G2702
PM-30
GI0053A