Jacobs Exhaust Brake for Cummins Medium Duty Engines (Non-Dodge Applications)
More Control. Every Stop.
Cummins E Brake uses engine exhaust backpressure to increase your vehicle's stopping ability significantly. By restricting
the flow of exhaust gases, it creates resistance against the pistons on every stroke. This, in turn, slows the rotation of
the crankshaft and your vehicle.
With Cummins E Brake, your engine (B5.9, ISB, C8.3, ISC or ISL) creates up to 237 hp of retarding power to help you slow down.
You use your service brakes less so they last up to three times longer. And having more braking power on long, steep hills
can help reduce the risk of overheating and glazing.
With every Cummins E Brake you get:
- Increased control on steep grades
- Increased brake life
- Lower vehicle operating costs
- Tamperproof design for consistent performance every time
- Cummins nationwide warranty
- The largest diesel service and parts network in North America
How Much Braking Horsepower Will I Get?
The higher the engine rpm, the more braking power you get. The chart below shows retarding power in horsepower.
| B5.9 | ISB | C8.3 | ISC | ISL | |
| 1400 RPM | 34 | 48 | 50 | 61 | 67 |
| 1600 RPM | 46 | 62 | 68 | 80 | 87 |
| 1800 RPM | 59 | 77 | 89 | 99 | 111 |
| 2000 RPM | 75 | 84 | 112 | 124 | 137 |
| 2200 RPM | 96 | 106 | 136 | 151 | 164 |
| 2400 RPM | 113 | 121 | 160 | 178 | 190 |
| 2600 RPM | 134 | 136 | 192 | 205 | 218 |
| 2800 RPM | 159 | 152 | 223 | 237 | - |
Every Question. Answered.
Cummins E Brake is the product of a joint venture between Cummins Inc., a world leader in diesel technology - and Jacobs Vehicle
Systems, Inc., the recognized leader in retarding technology. For more information about the Cummins E Brake, see your local
dealer or Cummins distributor, call1-800-CUMMINS(1-800-286-6467) or visit our web site at www.cumminsengines.com.
Exhaust Brake Kits For Cummins Medium-Duty Engines (Non-Dodge Applications) - Effective March 1, 2016.
| Engine Model | Build Year | Brake Configuration | Base Kit | Pneumatic Group | Pneumatic Group w/ Air Supply |
| B5.9 Mechanical | Pre-1998 | In-Pipe | 3802671 | 3803910 | 3802673 |
| ISB CM550 | 1998-2002 | Turbo Mount Half-Marmon | 3800442 | 3806238 | 3806237 |
| ISB CM550 | 1998-2002 | Turbo Mount Full-Marmon | 3800443 | 3806238 | 3806237 |
| ISB CM550 | 1998-2002 | In-Pipe | 3800441 | 3806238 | 3806237 |
| ISB CM850* | 2002-Till Date | Turbo Mount Full-Marmon | 4089591 | 3806238 | 3806237 |
| ISB CM850* | 2002-Till Date | In-Pipe | 4089593 | 3806238 | 3806237 |
| ISB 6.7L CM850/2150 |
Euro 4 (24V) | In-Pipe | 4352554 | 3284526 | N/A |
| ISB 6.7L CM850/2150 |
Euro 5 (24V) | In-Pipe | 4337608 | 3284526 | N/A |
| C8.3 Mechanical | Pre-1998 | In-Pipe | 3802672 | 3803910 | 3802673 |
| ISC ISL CM550 | 1998-2003 | Turbo Mount Half-Marmon | 3800414 | 3806238 | 3806237 |
| ISC ISL CM550 | 1998-2003 | Turbo Mount Full-Marmon | 3800415 | 3806238 | 3806237 |
| ISC ISL CM550 | 1998-2003 | In-Pipe | 3800372 | 3806238 | 3806237 |
| ISC ISL CM850 | 2003-Till Date | Turbo Mount Full-Marmon | 4089624 | 3806238 | 3806237 |
| ISC ISL CM850 | 2003-Till Date | In-Pipe | 4089623 | 3806238 | 3806237 |
| Compressed Air Cyl Replacement Kit | - | All Medium Duty | 4024995 | - | - |
* For useon engines with wastegate turbos only.
Note: Exhaust braking is an integral function of the VG turbo on ISC/ISL/ISB CM2150. Additionalexhaust brakes are not allowed.
Bulletin: 4081574