Subaru Legacy 2004 Service Manual page 3049

ABS (DIAGNOSTICS)
13.General Diagnostic Table
A: INSPECTION
Vehicle instability during braking
Poor brake performance
Vibration and/or noise
(while driving on slippery roads)
General Diagnostic Table
Symptom
Vehicle is pulled to either right or
left side.
Vehicle spins.
Long braking/stopping distance
Wheel locks.
Brake drag
Long brake pedal stroke
Vehicle vertical pitching
Unstable or uneven braking
Excessive pedal vibration
Noise from ABSCM&H/U
Noise from front of vehicle
Noise from rear of vehicle
ABS(diag)-82
Problem parts
• ABSCM&H/U (solenoid valve)
• ABS wheel speed sensor
• Brake (caliper, piston and pads)
• Wheel Alignment
• Tire specifications, tire wear and air pressures
• Incorrect wiring or piping connections
• Road surface (uneven, camber)
• ABSCM&H/U (solenoid valve)
• ABS wheel speed sensor
• Brake (pads)
• Tire specifications, tire wear and air pressures
• Incorrect wiring or piping connections
• ABSCM&H/U (solenoid valve)
• Brake (pads)
• Air in brake line
• Tire specifications, tire wear and air pressures
• Incorrect wiring or piping connections
• ABSCM&H/U (solenoid valve, motor)
• ABS wheel speed sensor
• Incorrect wiring or piping connections
• ABSCM&H/U (solenoid valve)
• ABS wheel speed sensor
• Master cylinder
• Brake (caliper and piston)
• Parking Brake
• Axle and wheels
• Brake pedal play
• Air in brake line
• Brake pedal play
• Suspension play or fatigue (reduced damping)
• Incorrect wiring or piping connections
• Road surface (uneven)
• ABSCM&H/U (solenoid valve)
• ABS wheel speed sensor
• Brake (caliper, piston and pads)
• Tire specifications, tire wear and air pressures
• Incorrect wiring or piping connections
• Road surface (uneven)
• Incorrect wiring or piping connections
• Road surface (uneven)
• ABSCM&H/U (mount bushing)
• ABS wheel speed sensor
• Brake line
• ABSCM&H/U (mount bushing)
• ABS wheel speed sensor
• Master cylinder
• Brake (caliper, piston, pads and rotor)
• Brake line
• Brake booster and check valve
• Suspension play or fatigue
• ABS wheel speed sensor
• Brake (caliper, piston, pads and rotor)
• Parking Brake
• Brake line
• Suspension play or fatigue