DOT inspection prep means going over a commercial trailer before its annual or roadside inspection and fixing anything that would fail it. Keep Them Rolling Trailer Repair handles that prep, and the repairs, at your yard or lot anywhere in Morris, Sussex, Warren and Hunterdon counties. The annual inspection itself is completed by a qualified inspector. Call (973) 651-1045.
A trailer that fails an inspection doesn’t just need a repair. It can be placed out of service until the defect is fixed, which means a load that sits, a driver who waits and a schedule that slips. Brad Smith, who owns the business, brings 30+ years of hands-on trailer repair to the job. Most of what fails an inspection is ordinary running gear wear that can be found and fixed ahead of time.
What this service covers
Brad handles the mechanical side of commercial trailer compliance:
- A pre-inspection check against the items inspectors look at on a trailer
- Repairs to anything that would fail, priced before the work starts
- Repairs after a failed inspection or an out-of-service order, where the trailer is parked
- Checks timed ahead of each trailer’s inspection date for businesses running several units
The annual inspection report has to be completed by a qualified inspector who meets the federal requirements, so line up who that will be well before the due date. Brad’s part is getting the trailer ready for that appointment and fixing whatever it turns up.
What inspectors check on a trailer
Federal inspection standards for trailers focus on the parts that keep a load attached, stopped and visible. On a typical commercial trailer, that means:
- Brakes. Drums, shoes or linings and adjustment. On air-brake trailers, the chambers, slack adjusters, hoses and any air leaks. On electric or surge brakes, the breakaway system has to apply the brakes if the trailer separates. Trailers built with ABS need it working, so Brad includes the anti-lock system in his check on equipped trailers.
- Lights and reflectors. Stop, turn, tail, marker and clearance lamps, plus reflectors and reflective sheeting where the trailer is required to carry it.
- Tires. Tread depth, cuts, bulges, exposed cord and inflation.
- Wheels and rims. Cracks, bent flanges, loose or missing lug nuts and elongated stud holes.
- Suspension. Leaf springs, hangers, equalizers, shackles and U-bolts.
- Frame. Cracks, broken welds, sagging rails and broken or missing crossmembers.
- Coupling devices. The coupler, gooseneck or pintle eye, the safety chains and their attachment points.
- Securement points. Tie-down anchors, rails and headers that have to hold the cargo in place.
What fails a DOT inspection
Most failures are worn parts nobody noticed, not dramatic damage. Brake problems are among the most common reasons trailers get written up. The usual list:
- Brakes out of adjustment, linings worn thin or soaked with grease from a leaking hub seal, and cracked drums
- One dead marker lamp, a cracked lens or a corroded ground that makes the lights flicker
- Reflective sheeting that has peeled or faded off the rear and sides
- Tires with cord showing, sidewall bulges or tread worn below the legal minimum
- Rust streaks running back from the lug nuts, a telltale sign a wheel has been loose
- A broken leaf in a spring pack, a cracked hanger or a missing U-bolt nut
- Cracks where the tongue meets the frame, and crossmembers rusted through
- Safety chains that are missing, too short or hooked to the wrong point, and a dead breakaway battery
- Bent or torn tie-down points
How a pre-inspection check works
Brad comes to where the trailer is parked. He works through the same items an inspector will, wheel by wheel and lamp by lamp, with the trailer connected to a tow vehicle or a tester so the lights and brakes can be checked live. Anything that would fail goes on a list with a price before a wrench turns. Brake adjustment, shoes, lamps, wiring, tires, spring parts and chains are usually handled on the first visit. Parts that have to be ordered, like a full axle or a specific brake assembly, mean a return trip.
Schedule the check a few weeks before the inspection date. That leaves time to order parts without cutting it close. For businesses running several trailers, fleet maintenance programs put each unit’s inspection date on the calendar so prep happens on schedule instead of in a rush.
After a failed inspection or out-of-service order
A trailer placed out of service generally can’t be driven until the defect is repaired. That’s where mobile trailer repair earns its keep: Brad comes to the yard, lot or job site where the trailer sits. Keep the inspection report and read him the listed defects on the phone so he can bring the right parts. Brake defects usually lead to the work described on the trailer brake repair page.
DOT prep is one part of Brad’s trailer inspection and maintenance services. If your trailer isn’t commercial and you just want to know its condition, a trailer safety inspection is the better fit. He covers the Morris County trailer repair area and the three counties around it. To get a check on the calendar, request service online.
Common questions
What does a DOT inspection consist of?
For a trailer, the annual inspection follows a federal minimum standard. The inspector checks the brakes, coupling devices, lights and reflectors, suspension, frame, tires, wheels and rims, plus any other systems that apply to that trailer, and records the result. A roadside inspection by an enforcement officer covers similar vehicle items and can add a review of the driver’s paperwork. Either way, a serious defect can put the trailer out of service until it is fixed.
What would fail a DOT inspection?
Worn or out-of-adjustment brakes, air leaks on air-brake trailers, lamps that don’t light, missing reflective sheeting, tires with exposed cord or too little tread, cracked wheels, loose lug nuts, broken springs, frame cracks and missing or damaged safety chains are the common failures. Nearly all of them can be spotted in advance by someone who knows where to look, which is exactly what a pre-inspection check is for.
How long does a DOT inspection take?
It depends on the trailer and the inspector. A single-axle trailer in good shape moves faster than a tandem or triple-axle unit where the brakes have to be checked at every wheel. Roadside inspections also vary with the level of inspection the officer chooses. The biggest time sink is usually a failure, since repairs and parts come on top of the inspection itself, so prep ahead of the date saves the most time.
Can you do your own DOT inspection?
The annual inspection must be done by a qualified inspector, meaning someone who meets the federal training or experience requirements. A motor carrier can use a qualified person on its own staff or send the trailer to an outside inspector. Either way, drivers and owners still do a pre-trip check before every run, looking at lights, tires, brakes, the coupler and chains, and they report anything wrong so it gets repaired.