1999 freightliner FLD 120 when I step on the brake pedal the yellow exhaust tube on the driver side firewall leaks air
Thank you the truck is a 99’ freightliner FLD 120 with AD-9 air dryer it doesn’t seem like a leak it seems more like it a clog on the primary...
Primary tank only fills to 75psi but secondary tank goes to 120psi I changed check valves air dryer the steel braided lines that goes from the air...