Component Tests

For vibration concerns when brakes are applied, carry out the following procedure.
Visually inspect:
- The suspension condition and tire pressure.
- Suspension bushings and ball joints.
Correct as necessary.
1. Verify and isolate the concern. Brake roughness can be felt in:
- the steering wheel.
- the seat.
- the brake pedal.
2. After verifying the concern, check for related concerns in the:
- Technical Service Bulletins.
3. Check wheel bearing end-play and correct as necessary.

4. Note: Begin at the front of the vehicle unless the vibration has been isolated to the rear. Remove the tire and wheel.

5. Remove the brake caliper.
6. Measure and record the brake disc thickness. If the thickness before machining is not greater than 0.6 mm (0.024 inch) above the minimum thickness specification molded into the brake disc, install a new brake disc. Do not machine a new brake disc.
7. For vehicles with a two-piece hub and brake disc assembly:
- Match-mark before disassembly.
- Remove the brake disc.
- Using a die grinder with a mild abrasive disc (Scotch Brite(r) type), remove any rust or corrosion from the hub and brake disc mounting surfaces.
- Align match-marks and reinstall the brake disc on the hub.

8. CAUTION: Do not use a bench lathe to machine brake discs.

Note: The depth of cut must be between 0.10 and 0.20 mm (0.004 and 0.008 in). Lighter cuts will cause heat and wear. Heavier cuts will cause poor brake disc surface finish.

Using a hub-mount brake lathe, machine the brake discs. Follow the manufacturer's instructions. After machining, make sure the brake disc still meets the thickness specification.
9. Using a dial indicator, verify that the brake disc lateral runout is now within vehicle specification.
10. Remove metal chips.
11. Remove the brake lathe hub adapter.
12. Remove any remaining metal chips from the machining operation.
13. For vehicles with a two-piece hub and brake disc assembly:
- Remove the brake disc from the hub.
- Remove any remaining metal chips from hub and brake disc mounting surfaces and from the ABS sensor.
- Apply High Temperature Nickel Anti-Seize Lubricant F6AZ-9L494-AA or equivalent meeting Ford specification ESE-M12A4-A to the mounting surfaces.
- Using the match-marks, mount the brake disc on the hub.
14. Install the caliper and check brake operation.