How does my engine brake work?
Engine brakes or Jacobs brake on diesel engines work by using engine oil pressure controlled by a electric solenoid in three stages, the oil pressure is directed to a piston which holds down an exhaust valve slightly approx 2.85-3.5mm.
The three stages of exhaust brake on a six cilinder engine activates two cylinders at a time, cylinders 1-2 stage one, cylinders 1-2-3-4 stage two, and 1-2-3-4-5-6 stage three.
A Volvo engine brass or VEB works kind of the same only it uses a separate lobe on the camshaft to open the valve for engine braking...
Hope this helps..
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