LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2000 >> Contour SE, 2.5 L, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1980 (Brake System - General Information) >> Diagnostic Tests >> Brake System >> Pinpoint Tests >> Pinpoint Test A: Vibration When Brakes Are Applied >> Pinpoint Test A: Vibration When Brakes Are Applied

Pinpoint Test A: Vibration When Brakes Are Applied

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. A1 CHECK OASIS FOR TSBs 
    • Check the On-Line Automotive Service Information System (OASIS) and Technical Service Bulletins (TSBs) for applicable brake concerns.
    • Is there applicable information available on OASIS or in a TSB? 
    1. YES  : REFER to OASIS or the TSB. CARRY OUT any necessary repairs that are indicated by OASIS or the TSB. If the concern is still present, go to  A2 .
    2. NO  : Go to  A2.
  2. A2 ROAD TEST THE VEHICLE - LIGHT BRAKING 
    • Inspect the wheels and tires. Refer to WHEELS AND TIRES article.
    • Road test the vehicle. Warm the brakes by slowing the vehicle from 80 to 32 km/h (50 to 20 mph) using light brake force. At highway speeds of 89-97 km/h (55-60 mph), apply the brake using light pedal force.
    • Is there a vibration/shudder felt in the steering wheel, seat, or brake pedal? 
    1. YES  : Go to  A5.
    2. NO  : Go to  A3.
  3. A3 ROAD TEST THE VEHICLE - MODERATE TO HEAVY BRAKING 
    • Road test the vehicle. At highway speeds of 89-97 km/h (55-60 mph), apply the brakes using moderate to heavy pedal force.
    • Is there a vibration/shudder? 
    1. YES  : Go to  A4.
    2. NO  : The concern is not present at this time.
  4. A4 NORMAL ACTUATION OF THE ABS SYSTEM DIAGNOSIS 
    • During moderate to heavy braking, noise from the hydraulic control unit (HCU) and pulsation in the brake pedal can be observed. Pedal pulsation coupled with noise during heavy braking or on loose gravel, bumps, or wet or snowy surfaces is acceptable and indicates correct functioning of the ABS system. Pedal pulsation or steering wheel nibble (frequency is proportional to the vehicle speed) indicates a concern with a brake or suspension component.
    • Is the vibration/shudder vehicle speed sensitive? 
    1. YES  : Go to  A6.
    2. NO  : The concern is not present at this time.
  5. A5 APPLICATION OF THE PARKING BRAKE 
    • This test is not applicable to vehicles with drum-in-hat type parking brakes. For vehicles with drum-in-hat type parking brakes, proceed to the next test step. For all other vehicles, apply the parking brake to identify if the problem is in the front or rear brakes. At highway speeds of 89-97 km/h (55-60 mph), lightly apply the parking brake until the vehicle slows down. Release the parking brake immediately after the test.
    • Is there a vibration/shudder? 
    1. YES  : Go to  A8.
    2. NO  : Go to  A6.
  6. A6 CHECK THE FRONT SUSPENSION 
    1. YES  : Go to  A7.
    2. NO  : REPAIR or INSTALL new components as necessary. REFER to FRONT SUSPENSION article. TEST the system for normal operation.
  7. A7 RESURFACE THE FRONT BRAKE DISCS 
    CAUTION: Do not use a bench lathe to machine the brake discs.
    NOTE: Follow the manufacturer's instructions to machine the brake discs. After machining, make sure the brake disc meets the thickness specification. Refer to FRONT DISC BRAKE article.
    • Resurface the front brake discs.
    • Road test the vehicle.
    • Is the vibration/shudder present? 
    1. YES  : Go to  A8.
    2. NO  : The concern is not present at this time.
  8. A8 CHECK THE REAR SUSPENSION 
    1. YES  : If the vehicle is equipped with rear disc brakes, go to  A9 .
    2. If the vehicle is equipped with rear drum brakes, go to  A10 .
    3. NO  : REPAIR or INSTALL new components as necessary. REFER to REAR SUSPENSION article. TEST the system for normal operation.
  9. A9 RESURFACE THE REAR BRAKE DISCS 
    CAUTION: Do not use a bench lathe to machine the brake discs.
    NOTE: Follow the manufacturer's instructions to machine the brake discs. After machining, make sure the brake disc meets the thickness specification. Refer toREAR DISC BRAKE article.
    • Resurface the rear brake discs.
    • Road test the vehicle.
    • Is the vibration/shudder present? 
    1. YES  : REFER to NOISE, VIBRATION AND HARSHNESS article.
    2. NO  : The concern is not present at this time.
  10. A10 RESURFACE THE REAR BRAKE DRUMS 
    NOTE: Follow the manufacturer's instructions to machine the brake drums. After machining, make sure the brake drum meets the thickness specification. Refer to DRUM BRAKE article.
    • Resurface the brake drums.
    • Road test the vehicle.
    • Is the vibration/shudder present? 
    1. YES  : REFER to NOISE, VIBRATION AND HARSHNESS article.
    2. NO  : The concern is not present at this time.
scientia non olet · About LEMON Manuals