BRAKES
SVEWRV
SVX
1992
Precaution for Supplemental Restraint System
"Airbag"
The Supplemental Restraint System "Airbag"
helps to reduce the risk or severity of injury to the
driver in a frontal collision.
The Supplemental Restraint System consists of
an airbag module (located in the center of the
steering wheel), sensors, a control unit, warning
light, wiring harness and spiral cable.
Information necessary to service the safety is
included
in the
"5-5.
SUPPLEMENTAL RE-
STRAINT SYSTEM" of this Service Manual .
WARNING :
" To avoid rendering the Airbag system inoper-
ative, which could lead to personal injury or
death in the event of a severe frontal collision,
all maintenance must be performed by an
authorized SUBARU dealer .
Improper maintenance, including incorrect re-
moval and installation of the Airbag system,
can lead to personal injury caused by uninten-
tional activation of the Airbag system .
All Airbag system electrical wiring harnesses
and connectors are covered with yellow outer
insulation . Do not use electrical test equipment
on any circuit related to the Supplemental
Restraint System "Airbag" .
++++
4-4
Page
M M ECHANISM AND FUNCTION .. . . . . ...... . . .... .. . . . ....... . ...... . . . 2
1 . Disc Brake ... . ..... . . . ...... .. ...... . . . .. ... . . . . . ..... . .. .... . . . . . . ... . . ...... . . . 2
2. Master Cylinder . . . .. .... . . ...... . . . . . ... . . . . . ..... . ...... . . . . . ..... . ...... . . . 4
3. Brake Booster ..... . . . .... . . ...... . . . . . ... . . . . . ...... ...... . . . .. ..... . ...... . . . 5
4. Proportioning Valve ... . ...... . . . . . ... . . . . . ...... ...... . . . . ...... . .. .... .. . 9
5. Anti-lock Brake System .. . . . . . .... . . .. ...... . . .... . . . ....... . .. ..... . . 12
6. Parking Brake .... . . . ...... ...... . . . . . .... . . . . ...... . . .... . . . . . ..... . .. ..... . . 21
S SPECIFICATIONS AND SERVICE DATA ... . . . . . ..... . . . ...... . 23
C COMPONENT PARTS ... ...... . . . . . .... . . . . ...... . . .... . . . . . ..... . . . ...... . 26.
W SERVICE PROCEDURE . . .... . . . . . . . ... . . . .. .... . . .... . . . . . ..... . . . ...... . 32
1 . Front Disc Brake . . . . .... . . ...... . . . . . ... . . . .. ..... . ..... . . . . ...... . . ...... . 32
2. Rear Disc Brake . . . . . .... . . ...... . . . . . ... . . . .. ..... . .... .. . . . ..... . . . ...... . 37
3. Parking Brake . ... . . . . . .... . . ...... . . . . . ... . . . .. .... . . .... .. . . . ....... . ...... . 42
4. Parking Brake Cable .. . . ...... . . . . . ... . . . . . .... . . ...... . . . ..... .. . ...... . 46
5. Parking Brake Lever .. . . ...... . . . . . ... . . . .. ..... . .... . . . . . ..... . . . ...... . 48
6. Master Cylinder .. . . . .... . . ...... . . . . . ... . . . . . ..... . ...... . . . .. .... . . ...... . 49
7. Brake Booster ..... . . . ..... . ...... . . . . . ... . . . . . ...... . ..... . . . .. . . ... . ...... . 52
8. Brake Hose and Pipe ®. . . ...... ...... . . . ....... . ...... . 56
9. Air Bleeding .. . ..... . . . ..... . ...... . . . . . ... . . . . . ...... ...... . . . . . ... .. . ...... . 57
10 . Brake Fluid Replacement . . . . ... . . . . . ...... ...... . . . .. ..... . ...... . 58
11 . Proportioning Valve . . . . ... .. . . . .. . . . . . . . .... . .. .... . . . . . . .... . .. .... . 59
12 . ABS Sensor . .. ... . . . . . ... . . . ...... . . . ... .. . . . ...... ...... . . . . . ..... . . ..... . 61
13 . Hydraulic Unit for ABS System . ...... ...... . . . . . ..... . ...... . 64
14. Electronic Control Unit for ABS System . . . ..... . ...... . 67
T TROUBLESHOOTING ®.... . . . . . .... .. .... . . . . . ..... . ...... . 68
1 . Entire Brake System .. . . . ...... . . . ..... . . . . ..... . . .... . . . . . ..... . . . .... . 68
2 . Troubleshooting for ABS ... . . . ..... . . . . ..... .. .... . . . . . ..... . . . .... . 70
3 . ABS Control Unit I/O Signal . ..... . . . . . .... .. .... . . . . . ..... . . . .... . 73
4. Diagram of ABS .. . . . . ... . . . .. .... . . . ..... . . . . . .... . . .... . . . . . ..... . . . .... . 76
5 . Troubleshooting Chart with Trouble Code . ..... . . . ..... 78
6 . General Troubleshooting Chart . . . . . .... . . .... . . . . . .. ... . . . ..... 92