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Home >> Subaru >> 2007 >> Legacy GT spec.B >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System (Abs) (Diagnostics) >> General Diagnostic Table >> Inspection

General Diagnostic Table: Inspection

GENERAL DIAGNOSTIC CHART

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