How to Deal with Trailer Brake Lock-up?
2 Answers
When a trailer experiences brake lock-up, it is necessary to inspect the ABS system and the braking system. If the trailer's braking system is pneumatic, the air pressure of the braking system should also be checked. Related information: 1. Trailer: A trailer refers to a vehicle that is towed by a motor vehicle but has no independent power drive. It consists of a motor vehicle (truck, tractor, or forklift) combined with one or more trailers. The cargo truck or towing vehicle serves as the driving section of the vehicle train, known as the main vehicle; the towed section is called the trailer. 2. Usage requirements: When empty, the trailer's stanchions should tilt inward at 30°. When loaded, the stanchions and the load-bearing beam should ideally remain perpendicular, with the maximum outward tilt angle of the stanchions not exceeding 7°. When transporting an empty trailer, ensure it is securely fastened to prevent bouncing and swaying on the vehicle, which could damage components and pose hazards. During loading, distribute the load reasonably between the vehicle and trailer to avoid overloading or uneven loading, as this can shorten the trailer's lifespan and damage its components. When unloading, carefully open the closure device to ensure personal safety.
I once experienced brake lock-up while driving a tractor-trailer on a long-distance haul, which was quite dangerous. The most urgent action is to safely decelerate and pull over to the shoulder—never force it on the highway, as it can easily lead to loss of control or a rollover. After stopping, check the air pressure gauge. If the pressure is too low, it might be due to an air line leak or a stuck relay valve. Try pushing the release valve or slowly releasing the parking brake to let the system reset. If that doesn’t work, let the brakes cool down for a while, as overheating can cause drum deformation and lock-up. Then, contact professional repair services—don’t attempt DIY fixes; safety comes first. For prevention, regularly maintain and inspect air lines, spring plates, and the air dryer to avoid moisture buildup and related failures.
