Too much brake pressure

"DIONYSUS" wrote

The brake option codes are actually "jb" codes. If you no longer have your option code label, you will need to go to a dealership parts counter and see if they can come up with your brake option code based on the serial number of your truck. I can't be sure if this is possible for a 79 vintage truck, but I know it's quite possible on late model trucks. The other option would be to pull the booster and simply have it rebuilt at a qualified place. There are heavy duty shops that have the capabilities to rebuild these boosters.

Ian

/me guesses scrawny 5'11" 135lbs kj doesn't know his own strength