Grigg:
Is a jake brake the same as a vacuum release? [/quote]
A Jake brake is a valve that blocks off the exhaust on a deisel engine to give more engine brakeing. It is used on all trucks that drive in the mountains & many other deisel trucks. It causes the loud noise you hear when a truck is slowing down. It gets its name from the original manufactoring co. Jacobs Co. Now many co's make them. Kind of like Band-aid.
