Weak Jake and truck that shakes like a milkshake machine when it’s on full jake

[aaronb]

How did you test the solenoids to know their working? Mine was doing this a few months back. I checked the solenoids with a multimeter and they were in spec. Rawze said it sounded like a sticking solenoid. I had an extra solenoid, so I changed the one towards the front of the engine. Mine has been smooth since then. My engine is a cm2250. The engine brake is the same as a cm2350. Also the pass through harness that goes to the solenoids can get bad, so oil can get into the wiring and cause issues.