Originally Posted by bobioknight
1993 cc magna, gillig chassis. I flip the switch on the dash and nothing happens. Any ideas how to start diagnosing this problem?
These might apply:
Cruise Control off for the test.
Releasing the accelerator causes it to engage.
Be above 35 mph to test the exhaust brake operation.
Does the exhaust brake light on the dash illuminate?
If still not working (tranny should downshift at the same time) then run a 12v positive wire direct to the solenoid near the exhaust brake to see if it triggers with power. If not, perhaps a fuse or ground wire problem.
If it triggers but the flap valve does not move, it is frozen open due to disuse/rust. Lube it with high temp superlube or similar and work the flap to break it loose.
Frozen open means it will not stop vehicle. Frozen closed will remove most acceleration power.
Lube it once a year. I leave the exhaust brake on almost all the time except in some city traffic situations which seems to help prevent siezure.
Go to the Pak Brake website for specifics and diagrams.