Trailer brake failures rarely happen without warning. Catching these five signs early can mean the difference between a scheduled repair and an emergency roadside call.
1. Audible air leaks
A hissing sound from brake lines or chambers, especially when the trailer sits parked, usually points to a leaking valve, line, or chamber diaphragm. Don't ignore it — air leaks reduce the system's ability to build and hold pressure.
2. Slow air build-up before a trip
If your air pressure gauge is taking noticeably longer to reach operating pressure than usual, something in the system is losing air faster than the compressor can replace it.
3. Uneven braking or pulling
A trailer that pulls to one side under braking, or brakes that seem to grab unevenly across axles, often signals a slack adjuster or chamber issue on one side of the trailer.
4. Grinding or squealing under braking
These sounds usually mean brake shoes or pads have worn down to the point of metal-on-metal contact — a problem that gets worse, and more expensive, the longer it's driven on.
5. A brake warning light that won't clear
Modern trailers with ABS systems will flag electrical or sensor faults with a dashboard warning light. A light that stays on after a full system check deserves a proper diagnostic, not a guess.
What to do if you notice these signs
Air brake systems are not something to drive on and hope for the best — reduced air pressure or uneven braking directly affects your stopping distance under load. If you notice any of these signs, get the system inspected before your next trip.
American Road Ranger diagnoses and repairs air brake systems roadside, 24/7, across the Augusta CSRA. Call (706) 351-2678 to get a technician dispatched to your location.