Disc Brake Specifications
DISC BRAKE ROTOR SPECIFICATIONS
| Application |
Disc Diameter - In. (mm) |
Original Thickness - In. (mm) |
Minimum Refinish Thickness - In. (mm) |
Discard Thickness - In. (mm) |
Rear Brakes |
Brake Assist |
| Gasoline |
| C Series (Light Duty Only) |
| JB1 |
11.86 (301.2) |
1.04 (26.4) |
0.980 (24.9) |
0.965 (24.5) |
11 X 2 Inch Drum |
Manual |
| JB3 |
11.86 (301.2) |
1.04 (26.4) |
0.980 (24.9) |
0.965 (24.5) |
11 X 2 Inch Drum |
Single Diaphragm Vacuum |
| G Series (Light Duty Only) |
| JB1 |
11.86 (301.2) |
1.29 (32.7) |
1.23 (31.2) |
1.22 (31.0) |
11 X 2 Inch Drum |
Manual |
| JB3 |
11.86 (301.2) |
1.29 (32.7) |
1.23 (31.2) |
1.22 (31.0) |
11 X 2 Inch Drum |
Single Diaphragm Vacuum |
| C & G Series (Except Light Duty), K & P Series |
| JB5 |
11.86 (301.2) |
1.29 (32.7) |
1.23 (31.2) |
1.22 (31.0) |
11.15 X 2.75 Inch Drum |
Dual Diaphragm Vacuum |
| JB6 |
12.50 (318.0) |
1.28 (32.5) |
1.23 (31.2) |
1.22 (31.0) |
11.15 X 2.75 Inch Drum |
Dual Diaphragm Vacuum |
| JB7 |
12.50 (318.0) |
1.28 (32.5) |
1.23 (31.2) |
1.22 (31.0) |
13 X 2.50 Inch Drum |
Dual Diaphragm Vacuum |
| JB8 |
12.50 (318.0) |
1.54 (39.1) |
1.48 (37.6) |
1.47 (37.3) |
13 X 3.50 Inch Drum |
Hydro-Boost |
| JF9 |
14.25 |
1.54 (39.1) |
1.48 (37.6) |
1.47 (37.3) |
13.75 X 1.54 Inch Disc |
Hydro-Boost |
| Diesel |
| All Models |
| JD3 |
11.86 (301.2) |
1.29 (32.7) |
1.23 (31.2) |
1.22 (31.0) |
11 X 2 Inch Drum |
Hydro-Boost |
| JD5 |
11.86 (301.2) |
1.29 (32.7) |
1.23 (31.2) |
1.22 (31.0) |
11.15 X 2.75 Inch Drum |
Hydro-Boost |
| JD6 |
12.50 (318.0) |
1.28 (32.5) |
1.23 (31.2) |
1.22 (31.0) |
11.15 X 2.75 Inch Drum |
Hydro-Boost |
| JD7 |
12.50 (318.0) |
1.28 (32.5) |
1.23 (31.2) |
1.22 (31.0) |
13 X 2.5 Inch Drum |
Hydro-Boost |