NHTSA
Improperly Machined Trailer Spring Brake Valve
If there is a delay of the spring brake application, the trailer may roll away after it has decoupled from the tractor, increasing the risk of a crash or injury.
Advance Engineered has notified owners, and will provide remedy kits, complete with instructions, to repair any affected SR-5 trailer relay valves, free of charge. The recall began on August 22, 2016. Owners may contact Advance Engineered customer service at 1-306-721-5678.