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JEEP
| Model | Year | Front | Rear |
| Grand Cherokee SRT8 | 2006-10 (WK1) |
|
|
| Grand Cherokee SRT8 | 2012+ (WK2) |
|
BJ-42 (28/32x30), or BJ-43 (34/34x30) +
|
| Trackhawk* | 2018+ |
|
BJ-42 (28/32x30), or BJ-43 (34/34x30) +
|
+ Two different piston sizes (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 (cm²) | Rear Caliper Piston Area (cm²) | 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 caliper setup requires larger rear 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 rotor (390x30mm) and pad (PD968), and will make the rear brake work harder, thereby alleviating brake stress on the front for a healthier, more balanced brake system.
Learn how our "reduced" bias rear brake kit helps a Viper track driver solve OE's too-much-rear-bias issue (opposite to Jeep/Durango's front bias).