![When you finally find the reason your trailer brakes won't engage, and you realize that is the least of your problems. : r/Justrolledintotheshop When you finally find the reason your trailer brakes won't engage, and you realize that is the least of your problems. : r/Justrolledintotheshop](https://external-preview.redd.it/Cg3fzwFpL5Ol7bw4FPCLrSucr_7BPV4rOqoFCG_f8OE.jpg?auto=webp&s=e83f15d8095bae9339b21afff1ce17d1532f8a95)
When you finally find the reason your trailer brakes won't engage, and you realize that is the least of your problems. : r/Justrolledintotheshop
![First post here. New to trucks, but got this yard mule that won't release trailer brakes. Changed TPP valve, dash valve, idk what's next. Keeps putting air into the blue hose when First post here. New to trucks, but got this yard mule that won't release trailer brakes. Changed TPP valve, dash valve, idk what's next. Keeps putting air into the blue hose when](https://i.redd.it/yn1zpi5gxs261.jpg)
First post here. New to trucks, but got this yard mule that won't release trailer brakes. Changed TPP valve, dash valve, idk what's next. Keeps putting air into the blue hose when
![Amazon.com: Southwest Wheel 10" X 2-1/4" TruRyde Trailer Electric Brake Assembly (1 Right + 1 Left) : Automotive Amazon.com: Southwest Wheel 10" X 2-1/4" TruRyde Trailer Electric Brake Assembly (1 Right + 1 Left) : Automotive](https://m.media-amazon.com/images/I/6115te8NG3L._AC_UF1000,1000_QL80_.jpg)