P59 LoadLeash - An Engine Brake designed for the heavy hauler!

As the only engine brake available for the class 3-5 truck market, Pacbrake's P59 LoadLeash provides big-rig engine braking performance when used in tandem with an exhaust brake. In addition to enhanced vehicle control and reduced brake fade, Pacbrake's LoadLeash can extend service brake life by up to 500%.

With decades of experience in manufacturing engine brakes, the engineering behind LoadLeash is no different from the rest of the engine brakes designed by Pacbrake.

Pacbrake's Loadleash allows you to drive your fully truck with confidence and peace of mind.

Applications :

P55006 : 2003 - early 2006 for Dodge 2500 / 3500 with a 5.9L ISB Cummins Engines (Standard Transmission).

P55007 : late 2006 - 2007 for Dodge 2500 / 3500 with a 5.9L ISB Cummins Engines (Standard Transmission).

 Product and Kit Features : 

  • Lightweight support housing replaces the factory valve cover spacer with no valve cover height increase.
  • Modular Engine Brake Control Component that is easily serviceable
  • Precision cast aluminum valve cover spacer
  • Intelligent controller and IP67 rated controller housing
  • Forged heavy duty bridges
  • Automotive grade wiring with abrasion protection
  • SAE & ISO rated fittings
  • SAE rated hose

 

How does the LoadLeash work?

It functions by holding the exhaust valves slightly off the seat during the complete engine cycle, with the exhaust brake providing exhaust back pressure. Two braking cycles are achieved:

1. The first braking cycle is accomplished during the exhaust stroke when the piston is pushing the cylinder pressure past the open exhaust valve against the “closed” exhaust brake.

2. The second braking cycle occurs during the compression stroke with the piston is pushing the cylinder pressure past the open
exhaust valve against the “closed” exhaust brake.

The expansion stroke is eliminated by the open exhaust valve. With work being done on both the compression stroke and exhaust stroke we are now doing retarding work on two engine cycles.

Driving Impressions: Seat of the pants feel is noticeable, particularly above 2500 RPM with a heavy load. Manual downshifting may be required. The LoadLeash is stronger at all RPMs and in most cases will control the vehicle/load in a chosen gear without the rapid downshifting and high engine RPM experienced with the exhaust brake use alone.