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Its an odd one. And honestly the brake system is not my specialty. 1998 M1088 tractor. Air blows out the front emergency gladhand, builds proper pressure with the offending gladhand blocked off. Was going to work on that issue eventually. Brake pedal/treadle works properly truck stops when pedal applied and it feels right. Parking brake engaged via dash control and spring brakes are still released. Followed the TM troubleshooting this morning. Replaced the inversion valve and anti-compound valve even though they appeared to check out ok per TM steps. Replaced park and trailer dash valves and air lines to the cab floor, plus verified they are hooked up properly. Treadle in-cab air lines are correct. Still no parking brake. No service brake air leaks. Kind of thinking the air coming out the front emergency gladhand is related to the issue and some lines are swapped somewhere. On to under the cab tomorrow.
Will
Will