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Designed & Manufactured for Premium Performance

For over 20 years Pacbrake has successfully designed and manufactured premium engine brakes in-house. The precise machining and timing requirements of engine brakes make them the most challenging supplemental brake solution to design and manufacture. Requiring a true understanding of their integration into the engine, this braking device is something that very few companies can successfully produce. With over 55 years of experience and approved OEM products, Pacbrake has the ability to supply the highest quality engine brakes available today.

Engine Brake Highlights

  • Replacement parts and kits for Caterpillar, Cummins, Detroit & Mack
  • Improves control on hills, exit ramps and flat ground deceleration
  • Reduces tire wear by eliminating wheel hop and lock-up skid
  • Single housing design for easy installation and servicing
  • 3 levels of retarding power (low/med/high)
  • Increases the resale value of the vehicle
  • State of the art CNC machining

Engine Brake Specifics

  1. Patented pacbrake paclash
  2. Heavy duty compression spring design
  3. Positive control valve indexing
  4. Precision machined and hardened master & piston link


What is an engine brake?

A compression release engine brake, frequently called a Jake brake, is an engine braking mechanism installed on some diesel engines.
When activated, it opens exhaust valves in the cylinders after the compression cycle, releasing the compressed air trapped in the cylinders, and slowing the vehicle.

The term Jake brake, which properly refers to the Jacobs brand of engine brakes, has become a genericized trademark and is often used to refer to engine brakes or compression release engine brakes.

My engine brake will not turn on

Generally, if your brake has stopped working entirely, you have an electrical problem. This is most likely a failed switch (probably a fuel pump or clutch switch). You can usually confirm this by hot-wiring the brake, bringing battery power directly to the solenoid leads (with the engine at idle).

Be sure to disconnect the existing leads to the solenoids so that you do not damage your control system.

If the brake does not operate when hot-wired, you may have a solenoid failure. If the solenoid is actuating but the brake is not turning on, the problem is probably mechanical.

Your engine brake dealer should be able to help you locate appropriate troubleshooting information for your engine brake.

Where can I get replacement parts for my engine brake?

Looking for engine brake replacement parts? Please visit or call Pacbrake directly at 800-663-0096 for further assistance.

Warranty Registration

Register your product for warranty HERE.