Subaru 2009 IMPREZA Service Manual page 2565

13.General Diagnostic Table
A: INSPECTION
Symptom
Poor brake per- Long braking/
formance stopping dis-
tance
Wheel lock
Brake drag
Long brake
pedal stroke
Vehicle vertical
pitching
Poor brake per- Unstable or
formance uneven braking
General Diagnostic Table
Main probable cause
• VDCCM&H/U
• Brake pad
• Aeration to brake line
• Tire specifications, tire wear and air
pressures
• Incorrect wiring or piping connections
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Incorrect wiring or piping connections
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Master cylinder
• Brake caliper
• Parking brake
• Axle and wheels
• Brake pedal play
• Aeration to brake line
• Brake pedal play
• VDCCM&H/U
• Road surface (uneven)
• Suspension play or fatigue (reduced
damping)
• Incorrect wiring or piping connections
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Brake caliper
• Brake pad
• Road surface (uneven)
• Tire specifications, tire wear and air
pressures
• Incorrect wiring or piping connections
VDC(diag)-103
VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
• Defective ABS wheel speed sensor or sensor
gap
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & G sensor or improper
installation
• Master cylinder
• Brake caliper
• Disc rotor
• Brake pipe
• Brake booster
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & G sensor or improper
installation
• Brake caliper
• Brake pipe
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & G sensor or improper
installation
• Brake pad
• Brake pipe
• VDCCM&H/U
• Master cylinder
• Brake caliper
• Brake pad
• Brake pipe
• Brake booster
• Defective ABS wheel speed sensor or sensor
gap
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & G sensor or improper
installation
• Defective ABS wheel speed sensor or sensor
gap
• Defective steering angle sensor or improper
neutral position
• Defective yaw rate & G sensor or improper
installation
• Master cylinder
• Disc rotor
• Brake pipe
• Axle and wheels
• Road with crowns or banks
• Suspension play or fatigue (reduced damping)
Other probable cause