Caution: Refer to Safety Glasses Caution in the Preface section.
Caution: Refer to Vehicle Lifting Caution in the Preface section.
Caution: Refer to Brake Dust Caution in the Preface section.
Important:
• The brake discs do not require refinishing as part of routine brake system
service. NEW brake discs do not require refinishing. • DO NOT refinish brake discs in an attempt to correct the following conditions: - Brake system noise - squeal, growl, groan - Uneven and/or premature brake pad wear - Superficial or cosmetic corrosion/rust of the brake disc friction surface - Scoring of the brake disc friction surface less than the maximum allowable
specification • Before refinishing a brake disc, the brake disc must first be inspected
for adequate thickness to allow the brake disc to be refinished and remain above the
minimum allowable thickness after refinish specification. Refer to
Brake Rotor Thickness Measurement. • Brake discs should only be refinished if they have adequate thickness
to be refinished and if one or more of the following conditions exist: - Thickness variation in excess of the maximum allowable specification. - Too much corrosion/rust and/or pitting. - Cracks and/or heat spots. - Too much blueing, discoloration. - Scoring of the brake disc surface in excess of the maximum allowable specification. • Brake discs may need to be refinished as part of the process for correcting
brake disc assembled lateral runout (LRO) that exceeds the maximum allowable specification.
Important: Whenever the brake disc has been separated from the hub/axle flange, clean any rust or contaminants from the hub/axle flange and the brake disc mating surfaces. Failure to do this may result in increased assembled LRO of the brake disc, which may lead to brake pulsation.
12.1. | Follow the brake lathe manufacturer's recommended speed setting for applying a non-directional finish |
12.2. | Using moderate pressure, apply the non-directional finish: |
• | If the lathe is equipped with a non-directional finishing tool, apply the finish with 120 grit aluminum oxide sandpaper. |
• | If the lathe is not equipped with a non-directional finishing tool, apply the finish with a sanding block and 150 grit aluminum oxide sandpaper. |
12.3. | After applying a non-directional finish, clean each friction surface of the brake disc with denatured alcohol, or an equivalent approved brake cleaner. |