| Item | Value | Description |
| Nominal Disc Diameter | 318 mm (12.5 inch) | The number 318 in model WCB stands for friction disc diameter |
| Overall Outer Diameter of Brake | 478 mm | Maximum outline dimension of mounting flange |
| Effective Width of Friction Disc | 76.2 mm | Effective contact width of friction surface |
| Inner Diameter of Standard Air Tube | 320 mm | Matches Φ318 brake disc |
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