Note: on all car models, brake discs with internal air cooling are installed on the front axle. The TURNIER models and the 2.9L 24-valve engine have air-cooled brake discs on the rear axle, while the other models have massive brake discs at the rear.
Mark the position of the wheels on the hubs.
Thanks to this, the balanced wheel can be installed again in its original position. Mark with chalk or paint by running the line through the rim and hub.
When loosening the wheel nuts, the vehicle must be on its wheels. Raise the car on stands and remove the wheels.
Measure the brake disc thickness. At the service station, a special caliper or micrometer with a bracket is used for this, since during operation a shoulder is formed on the brake disc. The thickness of the brake disc can also be measured with a conventional caliper, but then a rigid gasket must be placed on each side of the disc (e.g. 2 10 pfennig coins). To obtain the thickness of the brake disc, the thickness of the pads must be subtracted from the measured size.
Attention: Measurement should be carried out at eight points every 45° (1/8 circle) around the brake disc.
Brake disc dimensions see p. 121.
If the wear limit is reached, replace the brake discs.
If there are large cracks or grooves with a depth of more than 0.5 mm, replace the brake discs.
If a linear travel indicator is available, the lateral runout of the brake disc can be measured without removing the brake disc. Install the indicator as close as possible to the outside diameter of the disc. Prescribed value: Lateral runout must not exceed 0.1 mm. More significant lateral runout may be due to a broken front wheel bearing. For a more accurate check, you should contact a service station for FORD cars.
Attach the wheels so that the marks applied before removal coincide. Tighten the wheels with nuts. Lower the vehicle and tighten the wheel nuts crosswise to 100 Nm.
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