C brake swap to Jake brake

@OLDSKOOLERnWV

 

He taged someone who may have information so that person can be alerted to the need for thier wisdom amd knowledge.

 

Jimmy is pretty familiar with those engines - he’ll chime in shortly.

Instead of me throwing out some uninformed idea, it’s better to tag a hand that’s probably fooled with it before.
I went through a PAC brake to Jake conversion on my 12.7 , but it’s not relevant.

 

Let’s start here, just because it will bolt on doesn’t always mean we should. I honestly don’t know much about the old C brakes, other than my experience was a Jake would hold better….

 

@OLDSKOOLERnWV posted the same info i have.
The funny thing about the jake models for the old engines is they have rendered 10 to 15 old model numbers obsolete and condensed the parts into two different kits now. So its even more confusing when you have an old set of boxes. My ‘74 350 still has its model 20’s on it. They were rebuilt in 2009 with the 425A kit. I think that is now obsolete.

 

Been many years since I drove a truck with C brakes, that was a 1988 K100 with a 365 Cummins….

The 425A is what I run still today.

Mine like a couple other models use the rubber O-ring on the oil supply to the Jake solenoid, where others use a gasket….