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Disc Brakes & Drum Brakes: Troubleshooting

BRAKE MECHANICAL PROBLEM SYMPTOM TABLE

Symptom  Suspect Area 
Lower pedal or spongy peda
  1. Fluid leaks for brake system
  2. Air in brake system
  3. Piston seals (Worn or damaged)
  4. Master cylinder (Faulty)
  5. Booster push rod (Out of adjustment)
Brake drag
  1. Brake pedal freeplay (Minimal)
  2. Parking brake pedal travel (Out of adjustment)
  3. Parking brake wire (Sticking)
  4. Rear brake shoe clearance (Out of adjustment)
  5. Pad (Cracked or distorted) 6. Piston (Stuck)
  6. Piston (Frozen)
  7. Tension or return spring (Faulty)
  8. Booster push rod (Out of adjustment)
  9. Vacuum leaks for booster system
  10. Master cylinder (Faulty)
Brake pull
  1. Piston (Stuck)
  2. Pad (Oily)
  3. Piston (Frozen)
  4. Disc (Scored)
  5. Pad (Cracked or distorted)
Hard pedal but brake inefficient
  1. Fluid leaks for brake system
  2. Air in brake system
  3. Piston (Stuck)
  4. Pad (Cracked or distorted)
  5. Pad (Oily)
  6. Pad (Glazed)
  7. Disc (Scored)
  8. Booster push rod (Out of adjustment)
  9. Vacuum leaks for booster system
Noise from brake
  1. Pad (Cracked or distorted)
  2. Installation bolt (Loosen)
  3. Disc (Scored)
  4. Pad support plate (Loosen)
  5. Sliding pin (Worn)
  6. Pad (Dirty)
  7. Pad (Glazed)
  8. Tension or return spring (Faulty)
  9. Anti-squeal shim (Damage)
  10. Hold-down spring (Damage)
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