| 1 |
CHECK FOR TSBs
- Check Technical Service Bulletins (TSB) for applicable brake concerns.
- Is there applicable information available in a TSB?
|
Yes |
Refer to TSB. Carry out any necessary repairs that are indicated by the TSB. If the concern is still present, Go to next step. |
| No |
Go to next step. |
| 2 |
ROAD TEST THE VEHICLE - LIGHT BRAKING
- Inspect the wheels and tires. See
WHEEL AND TIRE INSPECTION / ADJUSTMENT
,
.
- 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?
|
Yes |
Go to step 5. |
| No |
Go to next step. |
| 3 |
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 brake using a moderate to heavy pedal force.
- Is there a vibration/shudder?
|
Yes |
Go to next step. |
| No |
The concern is not present at this time. |
| 4 |
NORMAL ACTUATION OF THE ANTI-LOCK BRAKE SYSTEM (ABS) 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, 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?
|
Yes |
Go to step 6. |
| No |
The concern is not present at this time. |
| 5 |
APPLICATION OF THE PARKING BRAKE
- Apply the parking brake to identify if the problem is in the front or rear brake. 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?
|
Yes |
Go to step 8. |
| No |
Go to next step. |
| 6 |
CHECK THE FRONT SUSPENSION
- Check the front suspension. See
SUSPENSION DIAGNOSIS
,
.
- Are all the suspension components in satisfactory condition?
|
Yes |
Go to next step. |
| No |
Repair or install new components as necessary. Test the system for normal operation. |
| 7 |
RESURFACE THE FRONT BRAKE DISCS
CAUTION:
- Do not use a bench lathe to machine brake discs.
NOTE:
- Follow the manufacturer's instructions to machine the brake discs. After machining, make sure the brake disc meets the thickness specification.
|
Yes |
Go to next step. |
| No |
The concern is not present at this time. |
| 8 |
CHECK THE REAR SUSPENSION
- Check the rear suspension. See
SUSPENSION DIAGNOSIS
,
.
- Are all the suspension components in satisfactory condition?
|
Yes |
Go to next step. |
| No |
Repair or install new components as necessary. Test the system for normal operation. |
| 9 |
RESURFACE THE REAR BRAKE DRUM
NOTE:
- Follow the manufacturer's instructions to machine the brake drums. After machining, make sure the brake drum meets the thickness specification.
- Resurface the rear brake drums.
- Road test the vehicle.
- Is the vibration/shudder present?
|
Yes |
See
SUSPENSION NVH DIAGNOSIS
,
to continue diagnosis of the vibration. |
| No |
The concern is not present at this time. |