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JEEP
| MODEL | YEAR | FRONT | REAR |
| GRAND CHEROKEE SRT8 | 2006-10 (WK1) | BJ-41 (44/44x32) |
|
| GRAND CHEROKEE SRT8 |
2012+ (WK2) |
BJ-61 (40/40/40X32) |
BJ-42 (28/32x30), Or BJ-43 (34/34x30) +
|
| TRACKHAWK* | 2018+ | BJ-62 (40/40/40X32) |
BJ-42 (28/32x30), Or BJ-43 (34/34x30) +
|
+ Two different piston size (28/32 & 34/34mm) of rear calipers for WK2/Trackhawk. Please check your rear calipers to make sure you order the correct sizes.
Brake bias ratio (Front/Rear):
- 72.6% / 27.4% If you have BJ-42 (28/32mm) rear calipers.
- 67.5% / 32.5% If you have BJ-43 (34/34mm) rear calipers.
*TrackHawk Front calipers are the same as SRT8 except with yellow color and longer legs for larger rotors (400 vs. SRT's 380mm).
Brake Bias Analysis:
| Model | Year | Front Caliper Piston Area (CM^2) | Rear Caliper Piston Area (CM^2) | Total Area | Front Ratio | Rear Ratio | Rotor Size (F/R) |
| SRT8 | 2006-11 | 60.82 | 28.4 | 89.22 | 68% | 32% | 360x32/350x28 |
| SRT8 | 2012+ | 75.4 | 36.32 | 111.72 | 67.5% | 32.5% | 380x32/350x28 |
| Trackhawk | 2018+ | 75.4 | 36.32 | 111.72 | 67.5% | 32.5% | 400x36/350x28 |
| Rear RB BBK# | 2012+ | 75.4 (OE) | 34.24 (RB4M) | 109.64 | 69% | 31% | 400x36/390x30 |
The above table indicates the newer SRT8 front 6 pot calipers set up requires a larger 4 pot calipers & rotors to keep the system in balance.
#This rear BBK is equipped with our RB4M3 calipers (32/34mm piston dia.) and comes with a larger rotors (390x30mm), and pad (PD968) and will make the rear brake works harder and thereby alleviate the brake stress on the front for a healthier, and more balanced brake system.
Learn how our "reduced" bias rear brake kit help Viper track driver solves OE's too much rear biased issue (opposite to Jeep/Durango front bias).