Important: It is not necessary to refinish the brake rotors when replacing the brake shoe and lining pads assemblies. |
• | Refinish the brake rotors only under the following conditions: |
- | The brakes are pulsating. |
- | The brake rotor has hot spots. |
- | The brake rotor is scored greater than 1.5 mm (0.060 in). |
• | The brake rotors have a minimum thickness cast into them. This is the minimum wear dimension and not a refinish dimension. Replace a brake rotor that will not meet the specified dimensions after refinishing. Refer to Brake Rotor Thickness Variation Check . A rotor that is too thin will not have the proper heat transfer capabilities. |
• | The proper performance of disc brakes requires accurate control of rotor tolerances. |
• | Use only precision equipment in machining. |
• | Regularly service the machine equipment, using the manufacturers' recommended procedures for maintenance. |
• | When refinishing rotors, do the following: |
- | Make sure that all tools, adapters, holders, vibration dampeners, and tool bits are in good condition. |
- | Use sharp cutting tools and tool bits. Dull or worn tools leave a poor surface finish that affects initial brake performance. |
- | Use replacement cutting tool bits the equipment manufacturer recommends. |
- | Use only vibration-dampening attachments while refinishing brake surfaces. These eliminate tool chatter, thereby promoting a better finish. |
- | Make sure the adapters are clean and free of nicks. |
• | The Ammco Brake Lathe and the Accu Turn Lathe are recommended off-vehicle brake drum and brake rotor lathes that achieve good results. Refer to Brake Lathe Specifications . If any other lathe is used, follow the manufacturer's instructions and recommendations. |