Jake brakes on freightliner work intermittently.

Your problems are electrical. Something isn't making good contact then a bump jars it. If it was an mechanical issue it wouldn't likely come back on after a bump. If you had the jakes rebuilt I'd take the truck back to the shop who re-built it and tell them to finish the job or find the root issue. You might have a broken wire.

Good luck,

Sophia

 

I had KIND OF similar issue: weak jake brakes. Mine turned out to be detent wear on the rocket shafts. Just happened to be time for an overhaul and my problems are now gone!!

Good luck with your repair....

Sophia

 

Wiring harness under valve cover.

check plug at ecm, jake control is on the big plug at back( facing firewall) the wires to the jake are the first ones below the notch. You can press on them with a awl or dental pick, make sure screw holding plug is tight.
With a abs code you may have wires rubbing together, sometimes it’s easier to replace the harness than spending hours looking.

 

First determine if the two issues are connected or just incidental to one another. Sometimes things happen at exactly the same time but have nothing to do with each other. I pray for you that they are separate issues and something simple like a broken connector or something.

 

Do you lose cruise control as well? Check the switch on the clutch. Might be loose.