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Engine Brake

Eaton's decompression engine braking technology for medium- and heavy-duty diesel engines delivers high braking power and reduces the total cost of ownership (TCO) for truck owners.

Eaton offers rocker arm-based 1 stroke, 1.5 stroke, and 2 stroke systems for overhead cam and cam in block engine architectures. 

The compression release engine brake provides several advantages to the commercial vehicle truck owner:

  • Reduces brake and tire wear
  • Avoids overheating and fading of primary brakes
  • Reduces or eliminates the need for a driveline retarder
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Engine Brake types in comparison

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1.5 and 2 stroke

  • Enables one additional brake cycle per cam revolution
  • Enhances maximum braking power throughout the engine speed range up to 75% vs. conventional single stroke engine brake. Can replace retarder on some applications
  • Compatible with SOHC and DOHC engine architectures

Hydrogen internal combustion vehicles require robust engine brakes

H2 ICE engines need more engine braking due to their low compression ratio – approximately 11.0:1 compared to a diesel engine’s 18.5:1. To offset the loss in compression power, testing has shown that Eaton’s 1.5 stroke engine brake delivers 40% more braking power at low speed compared to a conventional engine brake. If additional engine braking is required, the combination of an Eaton TVS supercharger and 1.5 stroke engine brake boosts this by an additional 20%.

Eaton 1.5 stroke engine brake
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Dedicated rocker

  • Single stroke braking
  • Dedicated brake cam lobe and rocker
  • Maximum braking power for single stroke systems
  • Maximum flexibility in cam design
  • Compatible with SOHC and DOHC engine architectures
  • Higher space claimed compared to Integrated Rocker solution
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Integrated rocker with reset

  • Single stroke braking
  • One cam lobe and one rocker for exhaust and brake lift
  • Re-set during lift: valve closing profile will not change in brake mode
  • Automatic lash adjustment on brake valve lift
  • Similar braking performance to Dedicated Rocker
  • Better packaging than Dedicated Rocker
  • Compatible with cam in block and SOHC architectures
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Integrated rocker without reset

  • Single stroke braking
  • One cam lobe and one rocker for exhaust and brake lift
  • Closing timing delayed in brake mode
  • Easier packaging than Dedicated Rocker and Integrated Rocker with reset
  • Compatible with cam in block and SOHC architectures

Core features

  • Fast response: activation and deactivation within one engine revolution
  • Minimized load on the system with maximum braking performance: engine brake on one single valve
  • Tight tolerance control ensures high consistency of valve lift