Trailer & Vehicle Restraint Repair in Los Angeles & Long Beach, CA
For trailer restraint and dock lock repair in Los Angeles & Long Beach, CA, call (385) 325-7138 when a restraint won't catch the trailer, won't let go, or its lights don't match what it's doing. This covers powered and manual vehicle restraints, their lights, controls and interlocks at warehouses, distribution centers and plants.
Call to describe the problem—if the door is stuck open or the dock is down, say so first.
Independent service-request website. Calls may be shared with an independent commercial dock-and-door repair company. That provider confirms availability, scope, pricing, and service terms.
Facts checked: September 24, 2026
What is a trailer restraint?
A trailer restraint — also called a vehicle restraint, truck restraint or dock lock — holds the back of a trailer at the dock while people and forklifts go in and out of it. Most grab the steel bar that hangs under the back of the trailer (the rear impact guard). Others hold a wheel. They usually work with a set of red and green lights so the driver and the dock crew know when it's safe to move.
| What you see at the dock | Type | What to mention |
|---|---|---|
| A hook that rises from the dock face and grabs the bar under the trailer | Hook-style restraint (powered) | "Hook-style, push-button" |
| A bar or barrier that slides up in front of the trailer's rear bar | Barrier-style restraint | "It's a bar, not a hook" |
| A device that pins or blocks a trailer wheel, on a track or arm | Wheel-based restraint | "Wheel restraint" |
| A lever or handle someone sets by hand | Manual restraint | "Manual" |
| Loose blocks placed at a wheel | Wheel chock | "Chocks" |
| Red and green lights inside and out, and a control box | Communication lights and controls | "Lights and control panel" |
Not sure which one you have? Just say "the dock lock." That's enough.
What failed? What to report
Say what you see and what the lights show. The company works out the cause. This table is not a diagnosis.
| What you see | Why it matters | How to report it |
|---|---|---|
| Hook won't rise to catch the trailer | The trailer isn't held | "Restraint won't engage at door [number]" |
| Hook won't let go | The trailer can't leave, and pulling away can damage things | "Dock lock won't release" |
| A trailer pulled away while it was locked | The restraint or the trailer's rear bar may be bent | "Trailer pulled out with the lock on" |
| It won't catch one particular trailer | Some trailers' rear bars sit higher, lower or are damaged | "Won't catch this trailer" |
| Lights stuck on red or green | People get the wrong signal | "Lights stuck on red" |
| Lights don't match the hook | The system and the signal disagree | "Lights say locked, hook is down" |
| Alarm keeps sounding | The system sees a fault | "Alarm won't stop" |
| Restraint was hit or run over | Parts may be bent or torn off | "A truck backed over the lock" |
| Leveler or door won't run until the lock is set | The interlock (a link that makes equipment run in order) is doing its job — or has failed | "Interlock won't clear" |
Restraint stuck with a trailer at the door?
If a restraint won't let go, won't catch, or the lights are wrong, call and say so first. Keep people clear of the trailer and the dock edge. Follow your facility's dock procedure for holding the trailer and taking that door out of use. Don't pry the hook, don't let the driver pull away until your procedure says it's clear, and never bypass, jump or override the restraint, its lights or the interlock.
Bypassing a restraint to keep a door running removes the thing that's holding the trailer. That's why the right move is your facility's procedure and a phone call — not a workaround.
If the dock is down, say so first.
What do the rules say?
Federal OSHA does not require a powered vehicle restraint. Many sites use one, or use wheel chocks, as part of their dock procedure. ANSI MH30.3 is the industry standard for vehicle restraining devices. California's Title 8 §3336 requires employers to prevent trucks, trailers and railcars from pulling away before loading or unloading is complete; it points to other rules for securing vehicles boarded by forklifts. Ask your safety lead what your site's procedure requires.
| Rule or standard | What it is | What to do with it |
|---|---|---|
| Federal OSHA | Does not require a powered vehicle restraint | Follow your facility's own dock procedure |
| Cal/OSHA Title 8 §3336, "Loading Dock Operations" | Requires an employer system against early pull-away and refers to vehicle-securing rules | Ask your safety lead how your site applies it |
| ANSI MH30.3 | Industry standard for vehicle restraining devices | Ask the provider how the repair meets the maker's instructions |
| The manufacturer's manual | How that model is serviced | The provider works to it |
More background: vehicle restraints vs. wheel chocks.
Names you may see on a restraint
If a name is already on file or on the control panel you can see from a safe spot, mention it. Don't crawl near the hook to find a label.
| Name you might see | What they make | Mention on the call |
|---|---|---|
| Rite-Hite | Vehicle restraints and dock locks (Rite-Hite) | Brand, if known |
| Serco | Vehicle restraints (Serco) | Brand, if known |
| Blue Giant | Mechanical and hydraulic restraints (Blue Giant) | Brand, if known |
| Nordock | Hook and wheel restraints (Nordock) | Brand, if known |
| McGuire | Vehicle restraints (McGuire) | Brand, if known |
Examples only. They don't mean any company is an authorized dealer or works on every brand.
How the call works
- Call (385) 325-7138. Say what the restraint is doing, what the lights show, the door number if you know it, and the facility address.
- Company confirms the job. If the request is shared with an independent commercial repair company, it confirms availability, scope, price and its own terms.
- You decide. Nothing is approved until you agree to it.
Example of what to say: "The dock lock at door 7 at our Long Beach warehouse won't release, and the lights are stuck on red." That's example wording — say it your way.
If you reach voicemail, leave the facility address, the door or dock number if known, what's wrong, and a callback number.
More on the process: how service requests work.
Ready to describe it? Make the call.
What does restraint repair cost?
We can't quote your restraint repair from a web page. The price depends on the restraint, the fault, parts, and access. Here's what to ask before you authorize work.
| What moves the price | Why | Ask the company |
|---|---|---|
| Trip or diagnostic charge | Many companies charge to come out and look | "Is there a trip charge, and does it go toward the repair?" |
| Restraint type | Hook, barrier, wheel and manual restraints use different parts | "Which parts failed?" |
| Motor or hydraulics | Drive parts cost more than a sensor | "Is it the drive, a sensor or the controls?" |
| Impact damage | A run-over hook may need major parts | "Is it repairable, or does it need replacing?" |
| Lights, controls, interlocks | Electrical faults take time to trace | "Is this the lights, a sensor or the control box?" |
| Parts wait | Some brand parts must be ordered | "How long for parts, and what do we do meanwhile?" |
| After-hours work | Some companies price it differently, if they offer it | "Is after-hours priced differently?" |
| Changes to the job | More damage can turn up once covers come off | "Will you get my approval before going past the quote?" |
A trip charge is for coming out. An estimate is a best guess. A written quote is the price for a set scope — get one before work starts.
Repair or replace?
Repair makes sense when a sensor, light, control or single part failed. Replacement comes up after serious impact damage, when parts are no longer made, or when the restraint no longer suits the trailers you get. Ask the provider to explain its call.
Ask how your restraint would be priced when you call.
Planned restraint checks
Restraints get hit, backed over and pulled against every day. Planned checks catch worn hooks, weak lights and sensor faults before a door goes down. Some models take real time to inspect because covers come off, so plan checks around receiving. A qualified provider sets the checklist. See dock equipment for seals, bumpers and lights at the same doors.
What's included and what isn't
Included: hook, barrier, wheel-based and manual vehicle restraints; dock locks; wheel chocks on arms or tracks; communication lights, control panels, alarms and interlocks with levelers and doors — at commercial buildings.
Not included:
- Trailer repair, including the trailer's rear bar, doors, suspension and axles.
- Car and truck repair, including seat belts and suspension.
- Boat docks and boat lifts.
- Concrete and dock pit work.
- Parts-only orders.
Levelers are on the leveler page. Seals, shelters and bumpers are on the dock equipment page.
Local checks before you hire
- License. Ask which California license class the company uses for the restraint and any electrical work, then check it on the CSLB license lookup.
- New wiring. In the City of Los Angeles, LADBS says "Electrical Permits are required for any electrical work" (LADBS). Long Beach, LA County Public Works, Orange County and other cities have their own offices — see the service area.
- Your dock procedure. Your safety lead decides how trailers are held while the restraint is down.
The provider and the permit office confirm what your job needs.
Where in LA County and Orange County
Calls are taken about restraints at facilities across Los Angeles County and Orange County. City pages: Carson and Rancho Dominguez, Vernon, City of Industry, Santa Fe Springs. See the full service area.
Frequently asked questions
Our dock lock won't release. What should we do?
Keep the trailer where it is and keep people clear. Follow your facility's procedure, and don't pry or bypass the restraint. Call and say "dock lock won't release" first. The repair company confirms when it can come.
Does OSHA require vehicle restraints?
Federal OSHA does not require a powered vehicle restraint. Many facilities use restraints or wheel chocks as part of their own dock procedure. Ask your safety lead what your site requires.
The lights say locked, but the hook is down. What do I report?
Report exactly that, and stop using the door the way your procedure says. Lights that don't match the restraint give people the wrong signal. The company checks the sensors, lights and controls.
Can I call about damage to the trailer itself?
No. Trailer repair, including the trailer's rear bar, is a different trade. This line is for the restraint that's part of the building.
Is a dock lock the same as a trailer restraint?
Yes. People say dock lock, trailer restraint, truck restraint and vehicle restraint for the same kind of equipment.
Call about a trailer restraint in Los Angeles & Long Beach
Call to describe the problem—if the door is stuck open or the dock is down, say so first.
Independent service-request website. Calls may be shared with an independent commercial dock-and-door repair company. That provider confirms availability, scope, pricing, and service terms.
Back to Los Angeles & Long Beach dock and door repair · Loading dock repair nationwide
Sources
Originally checked September 23, 2026; changed claims rechecked September 24, 2026.
- Cal/OSHA Title 8 §3336, "Loading Dock Operations" (text checked September 24, 2026)
- Federal OSHA vehicle-restraint position and ANSI MH30.3 scope (checked September 19, 2026)
- CSLB license lookup · LADBS electrical permits
- Manufacturer pages: Rite-Hite · Serco · Blue Giant · Nordock · McGuire