Brakes on third axle on my truck refuse to work. And when I remove brakes from second axle, the wheels on it still brake. So the game most probably assigns the 3rd axle brakes to the second axle wheels. I can't find anyhing wrong with the jbeam files so I have no idea why it doesn't work properly. If you need whole vehicle to check the problem, PM me.
Changing the slots order could work because it changes the part loading order. I've had this problem myself and this has fixed it. Code: "slots": [ ["type", "default", "description"] ["semi_spring_R_1","semi_spring_R_1", "Rear Springs & Airbags 1"], ["semi_shock_R_1","semi_shock_R_1", "Rear Shocks 1"], ["semi_driveshaft_r_short","semi_driveshaft_r_short", "Rear Driveshaft"], ["semi_differential_R_1","semi_differential_R_1_locking", "Rear Differentials"], ["semi_brake_R_1","semi_brake_R_1", "Rear Brakes 1"], //needs to be before the wheeldata_R_1 ["semi_wheel_R_1","semi_wheel_R_1", "Rear Wheels 1"], ["semi_wheeldata_R_1","semi_wheeldata_R_1", "Rear Spindles 1"{"coreSlot":true}], ["semi_swaybar_R_1","semi_swaybar_R_1", "Rear Sway Bar 1"], ["semi_spring_R_2","semi_spring_R_2", "Rear Springs & Airbags 2"], ["semi_shock_R_2","semi_shock_R_2", "Rear Shocks 2"], ["semi_brake_R_2","semi_brake_R_2", "Rear Brakes 2"], //needs to be before the wheeldata_R_2 after the wheeldata_R_1 ["semi_wheel_R_2","semi_wheel_R_2", "Rear Wheels 2"], ["semi_wheeldata_R_2","semi_wheeldata_R_2", "Rear Spindles 2"{"coreSlot":true}], ["semi_swaybar_R_2","semi_swaybar_R_2", "Rear Sway Bar 2"], ],
