Re: aftermarket engine brakes
He may have said that due to mechanical issues with the engine brake it is currently only working on 2 cylinders.
Originally Posted by eplurubus
Both the "Dynatard" (Mack's own proprietary engine brake) and the Jacobs engine brake are designed to brake on all 6 cylinders of a Mack 6 cylinder engine.
The Jake brake on a Mack usually had a "Hi/Lo" switch which would allow 6 cylinder braking in the "Hi" position, and 3 cylinder braking in the "Lo" position.
The Dynatard was 6 cylinder braking whenever it was activated.
Jake Brake is the better of the 2 setups.
If you can't shift it smoothly, you shouldn't be driving it.