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Brake System Leak Check > < Brake System Pressure Bleeding

Focus RS 2003 (09.2002-)

Brake System - General Information - Brake Disc Runout Check Focus RS 2003 (09/2002-)
General Procedures

Special Tool(s)

Dial Indicator Gauge (Metric)

205-069 (15-046)

Holding Fixture, Dial Indicator Gauge

205-070 (15-022A)

Holding Fixture, Dial Indicator Gauge (Disc Brake)

206-003 (12-003)
General Equipment
Micrometer 0-125 mm

Check
  1. NOTE:
    NOTE:The total dial indicator gauge reading should not exceed 0.05 mm.
    Using the special tools, measure the brake disc runout on the inner face of the brake disc (wheel and tire shown removed for clarity).
    1. Position the dial indicator gauge so that it contacts the brake disc approximately 10 mm from the outer edge.
    1. Slowly rotate the wheel and tire and note the readings.
  1. NOTE:
    NOTE:Using paint or typing correction fluid, mark the position of the wheel in relation to the wheel hub.
    Remove the wheel and tire. For additional information, refer to Section  204-04 Wheels and Tires.
  1. Remove the brake pads. For additional information, refer to Section  206-03 Front Disc Brake / 206-04 Rear Disc Brake.
  1. Install the wheel nuts and tighten the wheel nuts to 10 Nm, to hold the brake disc in place.

  1. NOTE:
    NOTE:The total dial indicator gauge reading should not exceed 0.05 mm.
    Using the special tools, measure the brake disc runout on the inner and outer faces of the brake disc (outer face measurement shown).
    1. Position the dial indicator gauge so that it contacts the brake disc approximately 10 mm from the outer edge.
    1. Slowly rotate the brake disc and note the readings.

  1. NOTE:
    NOTE:If any of the readings vary by more than 0.015 mm or the brake disc thickness is less than the specified minimum, a new brake disc must be installed and the brake disc runout re-checked.
    Check the brake disc thickness variation.
    • Using a suitable micrometer, measure the brake disc thickness at eight positions, 45 degrees apart and approximately 15 mm from the outer edge of the brake disc.
  1. If all the brake disc runout measurements and the thickness variation are within the specifications, check the wheel balance.
  1. If just the brake disc runout measurement with the wheel and tire fitted exceeds the specification, the wheel and tire must be rotated through 90 degrees in relation to the brake disc and the brake disc runout re-checked.
    • If the brake disc runout measurement still exceeds the specification, repeat the wheel and tire rotation and checking process until the measurement is within specification.
  1. If the brake disc runout measurement without the wheel and tire fitted is outside the specification, check the wheel hub face runout.
  1. NOTE:
    NOTE:Using paint or typing correction fluid, mark the position of the brake disc in relation to the wheel hub.
    Remove the brake disc. For additional information, refer to Section  206-03 Front Disc Brake / 206-04 Rear Disc Brake.

  1. NOTE:
    NOTE:Make sure that the wheel hub face is clean and free of rust and foreign material.
    NOTE:
    NOTE:Re-position the dial indicator gauge so that it contacts the wheel hub approximately 10 mm from the outer edge of the wheel hub.
    Check the wheel hub face runout.
    • Slowly rotate the wheel hub and note the readings.
  1. If the wheel hub runout exceeds 0.03 mm, install a new wheel hub. For additional information, refer to Section  204-01 Front Suspension / 204-02 Rear Suspension.
  1. If the wheel hub face runout is within specification, install a new brake disc. For additional information, refer to Section  206-03 Front Disc Brake / 206-04 Rear Disc Brake.

Brake System Leak Check > < Brake System Pressure Bleeding