exhaust brakes

[jalex]

I have an '01 6 speed with a pac brake that has lots of retarding force. I have a cummings brake on a 1994 5 speed that the original owner bought because of warranty issues that has very little retarding force compared to the pac brake. Does anyone know if the cummins brake has a smaller baffle or other reason that it is less effective than the pac brake. thanks jlazram tucson, az.

 

[crabman]

If the previous owner did not change the exhaust springs to larger ones (60lbs) the exhaust brake will not operate as it should. {i. e. limited braking}

crabman

 

[NIsaacs]

Like crabman said, the 94 uses lighter valve springs from the factory over the 01. Most exhaust brakes are pre set or adjustable to 35 psi back pressure for the light springs and 60 psi for the heavy ones.





"NICK"

 

[jalex]

previous owner did change the springs, is the jacobs adjustable; if so how?

 

[SRadke]

Could be an adjustment issue or a leak somewhere in front of the brake.



-Scott

 

[Turbo Thom]

I would not get to aggressive with the brake on the 94 if the spring have not been changed. Backpressure will float the valves and there you go. Change the springs and see the difference.



And the baffle is only the size of the opening the brakes has. Whatever that is. Adjustable, I don't thing so.



. . Preston. .



. . Preston. .

 

[NIsaacs]

Most exhaust brakes have an adjustment on the piston rod that controls the butterfly. Be careful, you do not want over 35psi back pressure at max rpm for light springs and 60 psi for the heavy springs. The best way, is to use a pressure gauge for setting the system. There should be a port for this in front of the butterfly on the brake housing.





"NICK"