Peter Hill wrote:


The suck provides a bit of braking as it's on a shut throttle at idle
Uhhh, there's no throttle on a Diesel.
setting and the vacuum resists the piston downward motion.
The squeeze doesn't do much as it's not got much air to squeeze.
The bang usually isn't. Mixture will be so far off it misfires.
There will be no fuel sent to the cylinders when the compression brake
is applied.

It's effective on small vehicles but not trucks. To stop a truck the
engine would be revved to destruction before it did anything really
noticeable.

Actually, the Jacobson brake is QUITE effective, and can deliver about the
same braking effort as the engine at full power.

Jon