| Specifications | |
| Disc brakes | |
| Brake fluid type | Dot 4 |
| Brake pad minimum thickness | 2 mm (0.08 inch) |
| Front disc thickness | |
| XL600R, XR600R | |
| 1983 through 1987 | |
| Standard | 3.5 mm (0.14 inch) |
| Limit | 3.0 mm (0.12 inch)* |
| 1988 and later models | |
| Standard | 3.0 mm (0.12 inch) |
| Limit | 2.5 mm (0.10 inch)* |
| XR650L | |
| Standard | 4.0 mm (0.16 inch) |
| Limit | 3.5 mm (0.14 inch) |
| XR650R | |
| All except Australian models | |
| Standard | 2.8 to 3.2 mm (0.11 to 0.13 inch) |
| Limit | 2.5 mm (0.10 inch) |
| Australian models | |
| Standard | 3.3 to 3.7 mm (0.13 to 0.15 inch) |
| Limit | 3.0 mm (0 .12 inch) |
| Rear disc thickness | |
| XL600R, XR600R | |
| Standard | 4.5 mm (0.18 inch) |
| Limit : | 4.0 mm (0.16 inch)* |
| XR650L | |
| Standard | 5.0 mm (0.20 inch) |
| Limit | 4.0 mm (0.16 inch) |
| XR650R | |
| All except Australian models | |
| Standard | 3.8 to 4.2 mm (0.15 to 0.17 inch) |
| Limit | 3.5 mm (0.14 inch) |
| Australian models | |
| Standard | 4.3 to 4.7 mm (0.17 to 0.19 inch) |
| Limit | 4.0 mm (0.16 inch) |
| Disc runout limit | |
| XL600R, XR600R | |
| Front | 0.30 mm (0.012 inch) |
| Rear | 0.15 mm (0 .006 inch) |
| XR650L | |
| Front | 0.30 mm (0 .012 inch) |
| Rear | 0.40 mm (0.020 inch) |
| XR650R | |
| Front | 0.20 mm (0.008 inch) |
| Rear | 0.30 mm (0.012 inch) |
| Drum brakes | |
| Brake lining minimum thickness | – |
| Brake pedal height | – |
| Drum diameter | |
| XL600R | |
| Standard | 130 mm (5.12 inches) |
| Wear limit | 131 mm (5.16 inches)* |
| XR600R | |
| Standard | 110 mm (4.33 inches) |
| Limit | 111 mm (4.37 inches)* |
| *Refer to marks cast into the drum (they supersede information printed here) |