Subaru Legacy 2003 Service Manual page 3248

15.General Diagnostic Table
A: INSPECTION
Symptom
Poor braking Long braking
effectiveness distance
Wheel locks
Brake dragging
Long brake
pedal stroke
Vehicle pitching VDCH/U
Unstable or
uneven braking
GENERAL DIAGNOSTIC TABLE
Primary probable cause
VDCH/U
VDCCM
Brake pads
Air in brake line
Tire specifications, wear and pressures
Incorrect wiring or piping
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Incorrect wiring or piping
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Master cylinder
Brake caliper
Parking brake
Axle & wheels
Brake pedal play
Air in brake line
Brake pedal play
VDCCM
Uneven road
Suspension play or fatigue (reduced
damping)
Incorrect wiring or piping
VDCH/U
VDCCM
Faulty ABS sensor or sensor gap
Brake caliper
Brake pads
Uneven road
Tire specifications, wear and pressures
Incorrect wiring or piping
VDC-275
VDC (DIAGNOSTICS)
Secondary probable cause
Faulty ABS sensor or sensor gap
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Proportioning valve
Master cylinder
Brake caliper
Disc rotor
Brake pipe
Brake booster
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Proportioning valve
Brake caliper
Brake pipe
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Brake pads
Brake pipe
VDCH/U
Proportioning valve
Master cylinder
Brake caliper
Brake pads
Brake pipe
Brake booster
Faulty ABS sensor or sensor gap
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Faulty ABS sensor or sensor gap
Faulty steering angle sensor or improper neutral
position
Faulty yaw rate and lateral G sensor or improper
installation
Master cylinder
Disc rotor
Brake pipe
Axle & wheels
Crowned road or banked road
Suspension play or fatigue (reduced damping)